You'd think actual, practicing martial artists would know damn well how reality works

They do. That's why there are countless age categories in tournaments and men and women have seperate events.

Edit: Here are the britbong fencing categories for example: https://www.britishfencing.com/gbr-fencing/age-group-definitions/

You'd think actual, practicing martial artists would know damn well how reality works

They do. That's why there are countless age categories in tournaments and men and women have seperate events.