Why South African Men in Their 20s Are Testing Like Their Grandfathers

A 25-year-old in Pretoria and his grandfather at the same age would, on paper, be expected to have roughly the same testosterone levels. New research says otherwise — and the gap is bigger than most men realise.

A review published in January 2026 pointed to a clear, generational decline in male testosterone that can't be explained by age or genetics alone. It builds on a 2025 analysis of more than a million men across over 1,500 study groups, and an earlier study tracking 4,000+ men that found nearly a 25% drop in average testosterone among 15-to-40-year-olds over just two decades. Put simply: today's 30-year-old is, on average, testing lower than a 30-year-old a generation ago.

Why "just get older" doesn't explain it

Testosterone has always dropped with age — that part isn't news. What's different is that researchers are now seeing lower baseline levels in young men who haven't aged into decline at all. The usual suspects get discussed: rising obesity rates, more sedentary lifestyles, chronic stress, poor sleep, and environmental exposures are all raised as possible contributors, though no single cause has been settled on.

What it looks like in your 20s and 30s

Because nobody expects it at this age, the symptoms tend to get blamed on everything else first — a demanding job, a bad training block, "just being tired". Low energy, stalled gains despite consistent training, flatter mood, and stubborn body fat are the pattern that's showing up earlier than clinicians are used to seeing it. It's part of why South African men's health clinics report younger patients than they did five years ago asking to have their levels checked.

Getting an actual answer

A blood test, not a symptom checklist, is the only way to know where you stand — and it's worth doing regardless of age if the pattern above sounds familiar. For men who've had that conversation with a healthcare practitioner and confirmed low levels, Vitagenix's Testosterone Replacement Therapy kit offers a complete, quality-controlled protocol rather than something pieced together. Some men running a TRT protocol pair it with CJC-1295 to support the body's own growth hormone output alongside it.

None of this is a reason to self-diagnose or self-treat. It's a reason to test early rather than assume "tired" is just what your 20s and 30s feel like now.