Until a year ago, I would have told you that I wanted to be 21 forever. But I learned so much about myself and the world around me in 2011, that I'd pick 40. It wasn't the best year ever, but I discovered so many things and think I'm a better person for it.
You can help the HubPages community highlight top quality content by ranking this answer up or down.
At every age and stage of my life I have had experiences good and bad that have formed me. I am now at my most confident, contented and mellow, and this is the age I want to stay forever: my mature age!