I'm 23 and aside from what I've had to remember for some university courses, I can't really think of much that I learned in high school that I still use.
I think I learned most of what I needed to know before 9th grade...
I am 29 and I can't think of anything either.
I did just take an American History quiz on Facebook not because I enjoy history I found it boring in high school. I only took it because of July 4th. Surprisingly I actually got 100% on the quiz.
