Probably my middle school/high school years. I wouldn't have been such a slacker or a wagon jumper . >_> but that's being a kid for ya, I guess.
I think alot of us wish that what we know now....we wish we knew as kids, then we would have avoided some mistakes or so. But in reality, we live & learn and we wouldn't be the very same people we are today if we didn't go through some of those experiences we went through as kids.
Also, there's some of those who are in their 30s, 40s and 50s...who still don't learn. :lol: Maturity comes w/ experience, not w/ age.