system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do male athletes in sports like baseball, hockey, or football rarely debut before about age 20 and typically peak around age 25-27, but female tennis players can reach the top rungs of their sport at age 14/15 (Austin, Capriati, Hingis)?

You never see a 14-year-old male competing in competitive sports. Yes there was a 15-year-old baseball pitcher once, but he did very poorly. Typically superstars in these sports don't have even decent seasons until age 18 at the absolute earliest.

However, women in tennis sometimes burst onto the scene as 14 or 15-year olds.

Why? Is it their being female? Is it tennis?
gpt
Male athletic performance depends on muscular strength and power, which for most guys doesn't fully develop until their early 20s or even later.  

Female athletic performance isn't juiced by testosterone like male performance, and so those extra 5 years of the body maturing doesn't bring increased performance like it does for men.  In fact, in some sports the widening of the hips and ongoing breast development may make it harder for 20 something women to compete, in general.