hit the wall

verb2

1. •
   (informal) To experience sudden fatigue as a result of glycogen depletion, e.g. when cycling.
2. •
   (informal, offensive) Of a woman: to lose her physical attractiveness through growing older.

   • N. L. Shraman, How to Seduce a Girl? The Science of Seduction Ninety percent of girls hit 24, they hit the wall; 25 they hit the wall because they don't care take care of themselves. They don't know any better because they hit their peak so young.