Most people die at 25 and aren't buried until they're 75
More on the loneliness/time with people charts. That novelty and learning and socialising peak, then decline for the following decades.
Solutions:
- scheduled, recurring social events with friends and family. Make it more automatic
- Take a break every quarter. Design another level for for life's video game.
- Learn how to learn
- Celebrate the 25th birthday, like a passage into actual adulthood.
- Create rituals.