I'm 40 and just ran my first autocross at the end of last season. It's fun and definitely humbling as experienced folks in $500 miatas completely destroy your times in your new bazillion-dollar track machine. It feels good knowing I'm the one bottlenecking my times and not the car though, so it's not like I need to go spend money to get better. I'm going to hit up a bunch of events this year with our small group and I'll hit you up in advance if you'd like to join.