[tmn]

A possible factor on your observation is females athletically peaking earlier.

Edit. A quick investigation shows there is not a significant age difference between men and women for both top 10 player lists and top 100 player lists

[bigstrat2003]

Or just that younger women are hotter so they attract more of an audience.

[tmn]

Lol. I didn’t realize how important audience following was to winning tennis matches.