My Sperm Count Is 4× the Average at 47
Hi Friend,
While global sperm health is plummeting, my sperm count is over 4× the average. At age 47.
Global Decline — and My Numbers
Global data from 1973 to 2018:
- Sperm concentration declined by 51%
- Total sperm count declined by 55%
My sperm concentration (143 million) and count (380 million) both exceed 1973 levels — demonstrating you can maintain high fertility in the modern world.
Semen quality is a real-time readout of your biological age.
Why Semen Quality Matters Beyond Reproduction
Semen quality isn't just about reproduction. It's one of the clearest biomarkers of systemic aging: tightly linked to hormone health, inflammation, mitochondrial function, and metabolic fitness.
Across five lab tests in 3 months, my total motile sperm count (TMC) averaged 165 million — more than 4× the WHO threshold for natural fertility (40 million). My peak: 214 million.
My Numbers vs. Average for a 45-Year-Old
- Swimmers. Typical = 80 million. Mine = 165 million.
- Motility. Typical = 35%. Mine = 43%.
- Morphology. Typical = <5%. Mine = 8%.
My numbers consistently exceeded those averages by 2–4×.
Protocol for Optimal Sperm Health
- Sleep: 8+ hours nightly (sleep protocol)
- Reduce inflammation: omega-3s (Blueprint Omega-3 supplement coming soon), NAC, exercise
- Avoid testicular heat: no saunas (or sauna with a testicular ice pack — is sauna worth the hype?), tight underwear, or laptops
- Eliminate toxins: alcohol, cigarettes, plastics (microplastics test)
- Train hard: boost VO₂ max, lift weights
- Track: Testosterone, SHBG, LH, CRP + semen quality
If your computer is on your lap now, remove it. Keep those boys cool.
──
Bryan
Originally published in Bryan Johnson's Blueprint newsletter (June 11, 2025). This content is for informational purposes only and is not medical advice.