David Sinclair· PhD
after the age of 30 to 40, we lose about 1% of our testosterone levels, men and women, it's important for both sexes.
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The headline is broadly defensible, but the qualifications matter. Effect sizes vary by population, the strongest claims rest on shorter trials, and credible voices push back on how it's typically framed.
after the age of 30 to 40, we lose about 1% of our testosterone levels, men and women, it's important for both sexes.
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For men, it's more gradual and you can expect, I believe it's about 1% drop in total tests per year with an an approximate 2 to 3% drop in free each year as well.
So, in your 30s, you're starting to drop your testosterone.