To be honest, I haven't really tried to make up for the "lost years." The time that I spent in the organization helped make me who I am today. And for the first time in a long time, I like the person I see looking back at me in the mirror. (I wish he didn't have as much gray hair as he does, but I like him a lot more now.)
I agree with almost everyone else, it's never to late to chase your dreams. Heck, make some new ones, you're free to be who and what you want to be!!!