Male sexual function changes with age. That much is uncontroversial. The difficulty is that men are given two competing stories about it, and both are wrong. One says nothing should ever change and any decline is failure. The other says everything that changes is inevitable and there is nothing to be done.
The truth sits between them. Some changes are normal biology and need no treatment beyond understanding. Others are pathology that happens to become more common with age, which is a different thing entirely, and most of those are treatable. The purpose of this article is to help you tell them apart.
What drives the changes
Four processes account for almost everything.
Falling testosterone. After roughly the age of thirty, total testosterone declines by around one percent a year on average. This is gradual and highly variable. A sudden drop, or symptoms out of proportion to age, points to something other than normal ageing, and our page on testosterone deficiency covers assessment.
Vascular change. Arteries stiffen and the endothelium becomes less responsive. Because the penile arteries are among the smallest in the body, they show this first.
Tissue change. The smooth muscle within the erectile chambers gradually gives way to collagen, reducing elasticity and the efficiency of the mechanism that traps blood.
Neurological change. Nerve conduction slows and receptor density falls, which affects sensitivity and the intensity of orgasm.
All four are accelerated by smoking, diabetes, hypertension, obesity and inactivity. A sedentary man with poorly controlled diabetes may have the erectile physiology of someone fifteen years older. A fit man with normal metabolic health may barely notice the transition. Chronological age is a weaker predictor than most men assume.
Decade by decade
Twenties and thirties
Peak function. Erections are rapid, firm, frequent and often spontaneous. Refractory period, the interval before another erection is possible, is short. Ejaculatory control is often the limiting factor rather than erection quality, which is why premature ejaculation is the most common presenting complaint in this age group.
Anything significant here is worth investigating rather than accepting. ED in a man in his twenties or thirties usually has an identifiable cause: anxiety, sleep deprivation, alcohol or drug use, anabolic steroid use, or occasionally early metabolic or hormonal disease.
Forties
The decade where most men notice a change. Erections still occur reliably but may need more direct physical stimulation rather than arising from thought alone. Firmness may be slightly reduced. Morning erections become less frequent. The refractory period lengthens, often to a day or more.
This is also when vascular ED starts to appear, which makes the forties the most important decade for taking a symptom seriously. New ED here is a legitimate reason to check blood pressure, lipids, glucose and HbA1c. A health screening here is not premature.
Fifties
Erections generally require direct stimulation, may be less rigid, and are harder to sustain without continued stimulation. Ejaculatory volume and force reduce noticeably, and the sensation of impending ejaculation may soften. The refractory period can extend to several days.
Prostate symptoms begin to appear, and prostate medication becomes another contributor to sexual side effects. Peyronie's disease peaks in incidence in the fifties and sixties.
Sixties and beyond
Erections typically require sustained direct stimulation and are softer, though many men remain sexually active and satisfied. Orgasm intensity reduces, and some men experience ejaculation with a much smaller volume or occasionally none at all, which is not harmful. Sensitivity declines further.
Studies of older adults consistently show that satisfaction in this age group correlates much more strongly with partner availability, relationship quality and general health than with erection firmness.
What is normal ageing and what is not
| Change | Normal ageing | Needs assessment |
|---|---|---|
| Needing more direct stimulation | Yes, from the forties | If it appears abruptly |
| Slightly reduced firmness | Yes, gradual | If unable to penetrate |
| Longer refractory period | Yes | Not on its own |
| Fewer morning erections | Some reduction | Complete loss over months |
| Reduced ejaculate volume | Yes | Sudden change, or blood present |
| Reduced sensitivity | Yes, gradual | Numbness or pins and needles |
| New curvature | No | Always, especially with pain |
| Pain with erection or ejaculation | No | Always |
| Loss of libido | Mild reduction | Marked loss with fatigue |
The changes men ask about most
Does the penis get smaller
Often, modestly, and for three separate reasons. Reduced blood flow means a smaller maximal erection. Loss of elasticity in the erectile tissue limits expansion. And increased fat over the pubic bone buries part of the shaft, which reduces visible rather than actual length. The last of these is reversible with weight loss, and it is frequently the largest contributor.
Peyronie's disease also shortens the penis, and this is one of the reasons a new curvature should be assessed rather than tolerated.
Why does it take longer, and why is it harder to finish
Delayed ejaculation becomes more common with age as nerve conduction slows and sensitivity declines. It is also a common side effect of SSRIs, some prostate medications and alcohol. It is a genuine source of frustration and it is treatable, so it should not simply be accepted.
Why is there less ejaculate
Prostate and seminal vesicle output falls with age and with declining testosterone. Prostate surgery and some medications can cause retrograde ejaculation, where semen passes backwards into the bladder. That is harmless apart from its effect on fertility, but it is worth having explained rather than worried about. Blood in the ejaculate is a separate matter and should be assessed, as covered in our article on blood in semen.
Do I still need contraception and STI testing
Yes to both if relevant. Fertility declines but does not disappear, and STI rates among older adults in many countries have been rising, partly because condom use falls once pregnancy is no longer a concern. Our sexual health clinic guide covers testing.
Peyronie's disease: the change that is never just ageing
Of everything covered in this article, curvature deserves its own section because it is the one change that is routinely, and wrongly, filed under normal ageing.
Peyronie's disease is caused by a fibrous scar, or plaque, forming within the tunica albuginea, the fibrous sheath that surrounds the erectile chambers. As the plaque contracts, it pulls the shaft towards itself during erection, producing curvature, indentation or narrowing that was not present before. It becomes more common from the fifties onward and is more frequent in men with diabetes, hypertension and connective tissue conditions such as Dupuytren's contracture, but it is a distinct disease process, not a variant of ageing itself.
The condition typically runs through two phases. An active phase, usually lasting somewhere between six and eighteen months, during which pain on erection is common, and the degree of curvature is still changing, sometimes worsening from month to month. This is followed by a stable phase, once the plaque has matured, during which pain usually resolves but the deformity, if significant, generally does not correct itself.
This timeline matters clinically because several treatment options, including some oral and injectable therapies, are more useful during the active phase, while more established curvature in the stable phase is more often managed with traction therapy, or with surgical correction where the deformity prevents comfortable intercourse. Presenting early, ideally as soon as a change in shape is noticed, keeps the widest range of options open. Waiting a year or two to see if it settles, which is a common and understandable instinct, often means arriving at the stable phase with fewer non-surgical choices remaining.
The practical takeaway is simple: any new curvature, any new lump felt along the shaft, or any pain specifically associated with erection should prompt an assessment, regardless of your age and regardless of whether the change seems minor. A five-minute examination is usually enough to confirm or exclude the diagnosis.
When age-related change actually warrants assessment
Given everything above, it helps to be explicit about the line between "this is annoying but expected" and "this needs a doctor," because most men either over-medicalise a normal decline or under-report a genuine one.
Assessment is warranted, not merely optional, when any of the following apply: erections have become unreliable enough to interfere with penetration on more than an occasional basis; morning erections that were previously present most days have disappeared over a period of months rather than years; a change has appeared suddenly rather than gradually, since sudden change is far more suggestive of a discrete cause, whether vascular, hormonal, medication-related or psychological, than of ageing itself; libido has fallen sharply and is accompanied by fatigue, loss of muscle bulk or low mood, which together suggest hypogonadism worth testing for directly; there is any new curvature, lump or pain, as above; or urinary symptoms, such as a weak stream, frequent night-time urination or incomplete emptying, have appeared alongside the sexual change, which points towards the prostate as a shared underlying factor rather than two unrelated processes.
Conversely, gradual change that has taken years to become noticeable, that responds to more direct stimulation, and that occurs without pain, curvature or urinary symptoms, is far more likely to represent ordinary ageing and can reasonably be managed first through the lifestyle measures described above, with review if things do not improve or continue to worsen. The distinction is rarely obvious from the outside, which is exactly why an actual assessment, rather than self-diagnosis from an article, remains the most reliable way to know which category applies to you.
What actually slows the decline
The interventions are unglamorous and they work.
Aerobic exercise has the strongest evidence of any non-drug intervention for erectile function, acting through improved endothelial function. Forty minutes, four times a week, is roughly what the trials used.
Resistance training preserves muscle mass and supports testosterone.
Weight control matters twice over: visceral fat converts testosterone to oestradiol, and pubic fat hides length. Singapore uses lower body mass index thresholds for Asian populations, with 23 marking increased risk.
Not smoking is the single largest modifiable factor for penile blood supply.
Glucose and blood pressure control slows small vessel damage directly.
Sleep. Testosterone is produced predominantly during sleep, and untreated sleep apnoea undermines both hormones and vessels.
Regular sexual activity or erections. Regular oxygenation of the erectile tissue appears to help preserve it, which is one reason penile rehabilitation is used after prostate surgery.
Pelvic floor training. Evidence-supported for erection quality and for post-void dribble, which becomes more common with age. See our Kegel guide.
When to stop accepting it
Book an assessment if erections are no longer firm enough for penetration, if morning erections have disappeared over a period of months, if there is new curvature or pain, if libido has fallen markedly alongside fatigue and loss of muscle, if there is blood in the semen, or if urinary symptoms have appeared alongside sexual ones.
Age is a reason to expect gradual change. It is not a reason to accept a symptom that appeared this year.
Getting assessed in Singapore
Hisential sees men from across Singapore for age-related changes in sexual function, and the aim of a consultation is to separate normal ageing from treatable disease. Assessment covers history, examination and blood tests including morning testosterone, glucose, HbA1c and lipids. Consultation is from S$50 after GST before investigations. The clinic is on Orchard Road near Orchard MRT, and reviews can usually be done remotely.
Frequently asked questions
At what age do erections start to change?
Most men notice the first differences in their forties, typically needing more direct physical stimulation and finding morning erections less frequent. The pace varies enormously and depends far more on metabolic and vascular health than on age alone.
Is erectile dysfunction an inevitable part of getting older?
No. Some decline in erectile firmness and spontaneity is expected, but being unable to achieve an erection adequate for sex is a medical condition at any age, and it is usually treatable.
Does the penis really shrink with age?
A modest reduction is common, from reduced blood flow, loss of tissue elasticity, and fat over the pubic bone concealing part of the shaft. Weight loss reverses the last of these. A sudden or marked change, especially with curvature, suggests Peyronie's disease rather than ageing.
Why does it take longer to ejaculate as I get older?
Nerve conduction slows and penile sensitivity declines with age, so more stimulation is needed. Medications, particularly SSRIs and some prostate drugs, and alcohol are frequent contributors and are often the more fixable part.
Can I still improve my erections in my sixties?
Yes. Exercise, weight loss, glucose control and stopping smoking all improve erectile function at any age, and treatments including PDE5 inhibitors and shockwave therapy remain effective in older men.
Should I have my testosterone checked?
If you have marked loss of libido, fatigue, loss of muscle mass or low mood alongside erectile change, yes. Testing needs a morning sample, ideally repeated, interpreted alongside your symptoms rather than in isolation.
References
- Health Promotion Board Singapore, Asian body mass index guidance and physical activity recommendations.
- European Association of Urology, Guidelines on Sexual and Reproductive Health and on Male Hypogonadism.
- Feldman HA et al., Massachusetts Male Aging Study, age trends in male hormone levels and erectile function.
- Gerbild H et al., Physical activity to improve erectile function, systematic review and meta-analysis.