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You are right, in some athletes early 20s would probably be their peak physical condition. Mentally of course this may not always be the case.
For a 15 year old to have won those 2 matches at a slam is still exceptional, I'd even think coming from a set down and 4-1 down in the second match is even more impressive than beating Venus.
I wonder if the 5 sets in slams hinders such breakthroughs in the men's game.
But mainly as you say men at 20 are often very different physically to that of when they were 15.