I'm 60. I learned things in high school football - about physical conditioning and discipline, and being able to push myself - that have been valuable over the last 40 years.
In high school P.E. I learned how if you're sufficiently athletic teachers will let you bully weaker kids. On the other hand I use calculus everyday and it is fundamental to my understanding of the world.
The value of exercise, communication, leadership, training, taking risks, knowing the competition, and predicting your opponents to name a few.