You've heard wrong. SOME people will peak a little later. The "peak" happens right around the time your body has finished growing/developing. For most guys this is around age 18-20. You have a chance, though, based on genetics to hit another growth spurt between 18-25ish.
Your natural test levels will hover around that peak level for a few years before it starts to decline fairly rapidly (for most men) when you start closing in on 30.
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