Hair loss after 40: what's different about starting now

Most of what is written about male pattern hair loss is aimed at men in their twenties, who are told to start early and start now. That advice is sound, and it is no use at all if you are 44 and have been quietly watching your hairline for a decade. The questions at 44 are different, and so are two of the answers.

Age is not the limit. Duration is

Treatment works on follicles that have shrunk but are still alive. Over years of exposure to dihydrotestosterone, a sensitive follicle miniaturises — each cycle producing a finer, shorter, paler hair — until eventually it stops producing anything and the follicle is replaced by fibrous tissue. Miniaturised follicles can be coaxed back. Lost ones cannot, by any treatment currently available.

So the thing that decides what is possible is not how old you are. It is how long that area has been thinning, and how much of it is slick and shiny rather than fuzzy. A 45-year-old who first noticed it at 42 has more to work with than a 30-year-old who started at 19. Age correlates with duration, which is why the two get confused.

The PSA problem, which almost nobody mentions

This is the one that matters most after 40, and it is routinely left out of online consultations. Oral 5-alpha reductase inhibitors — the main prescription treatment for male pattern loss — roughly halve the level of prostate specific antigen in the blood, usually within six to twelve months of starting.

PSA is the blood test used to investigate the prostate. Men over 50 can request one, and men over 40 with a family history or of Black African or Caribbean heritage are often tested earlier. A result that has been halved by a hair loss tablet can look reassuring when it should not be.

• Tell whoever orders the test that you take it — this is on you, because it will not be on the form
• The working rule is to double the result when interpreting it
• A rising PSA on treatment is meaningful even if the number still looks low
• Consider a baseline PSA before you start, so there is a before to compare against

None of this is a reason to avoid treatment. It is a reason to make sure it is written in your GP record rather than living only in an order confirmation from an online pharmacy.

Side effects against a different baseline

Sexual side effects from 5-alpha reductase inhibitors are reported by a small minority of men, and they are real. The complication after 40 is that the background rate of erectile difficulty is already climbing — roughly four in ten men at 40, and more at each decade after. If erections change three months into treatment, both explanations are plausible, and assuming it is the tablet can mean missing the one that matters.

New erectile difficulty in a man over 40 deserves a blood pressure check, a lipid profile and an HbA1c regardless of what else he is taking. The vascular causes sit upstream of both problems.

Is it even male pattern loss?

The classic pattern — temples first, then the crown, with the back and sides untouched — is easy to recognise. What gets missed at this age is diffuse thinning, which has a longer list of causes and a different treatment.

• Thyroid disease, under- or over-active, both of which thin hair
• Iron deficiency, which is worth checking even without anaemia
• Medicines started in the last year — some blood pressure treatments, some antidepressants
• Telogen effluvium after illness, surgery, significant weight loss or a stressful period
• Scalp that is itchy, scaly, sore or scarred, which needs a diagnosis before anything else

Shedding that came on over weeks rather than years, loss that includes the back and sides, or anything happening to the skin itself: see a doctor before starting treatment. Months spent treating the wrong diagnosis are months the right one went untreated.

What results actually look like

In trials of oral treatment, the majority of men hold what they have and a minority regrow visibly. Starting later shifts that balance towards holding. Most men who are pleased with the outcome are pleased because five years passed and nothing got worse — which is a real result, and an unsatisfying photograph.

It also takes time to judge. Six months is the earliest anything can fairly be assessed, and twelve is better. Topical minoxidil, which needs no prescription, causes increased shedding in the first four to six weeks as resting hairs are pushed out — that is the treatment working, not failing, and it is where most people quit.

The part worth deciding before you start

Treatment holds the line only while it continues. Stop, and the hair you kept is lost over the following six to twelve months, arriving at roughly where you would have been anyway. Beginning at 44 is a commitment measured in decades, not a course of treatment.

Which makes doing nothing a legitimate answer rather than a failure of nerve. Male pattern hair loss is not harmful. Plenty of men decide that a daily tablet, a PSA caveat and an open-ended cost are not worth it to them, and that is a reasonable conclusion rather than one to be talked out of.

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