An interesting one
As for wishing I was older, I'll admit, I've done it, but I have NEVER wished I was younger... at least not that I can remember. Maybe because when I was younger, when I was at school, when I lived in the most boring town imaginable, when I had nothing important in my life, nothing that defined me, nobody who really understood or Saw me, I was miserable. It's something I never want to go back to.
The future though, I'm not sure any more... I know it's certainly something I'll never wish for again now I've reached this point, but I don't regret having done it before.