Sorry but Peaty is 37 and he is consistently getting beaten and has been for the past 3 or so years really. Plus he has been racing at an elite level since 17.
You can have a long career as a cyclist but starting late and becoming an elite is more an exception than a rule.
Also there are exceptions of footballers who started late in their career. Doesn’t make it a general rule though does it.
Peaty may be consistently beaten, but then you could argue so is Gwin (in that he comes 2nd or lower more often than 1st), Peaty’s still as quick/quicker than 90% of the qualifiers.
Becoming elite in any sport at any age is an exception rather than a rule, but cycling certainly seems to be easier than most to get to the top levels later in life, probably less for sprint diciplines like DH, track and BMX, but look at any time trial or road race and there’s a larger number of older compettitors. Just look at the TDF, loadsa guys in their 30’s and a fair few in their 40’s.