Everyone's on their own path to success, even celebrities. There are plenty of stars who got a late start at their careers, but some strike gold as teenagers, or even younger. What's more, it can be fascinating to see the effects of being in the spotlight at such a young age. We've already looked at what 20 starlets were doing at age 20, and now it's time for the guys. What were they doing at that age? And how did they feel about their fame? We did some digging, trying to gain perspective and context for today's new generation of Hollywood royalty. Read on to find out what 20 of today's most famous male stars were doing the year they turned 20.