"Most people die at 25 and aren't buried until they're 75" - Benjamin Franklin
Why?
4 reasons and solutions:
Reason 1 - Milestones
0-25 is a well-designed video game.
You level up each year.
There are regular milestones as you go from infancy to school to entering the workforce.
You constantly feel like you're making progress -- and have reflective milestones.
After 25, it's a terribly designed video game.
Society places you on your own.
If you don't have the agency to design your own 25+ video game, the only milestones life will give you are the funerals of your loved ones -- followed by your own funeral.