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20. Joan Jett
Music legend Joan Jett — of "I Love Rock 'n' Roll" and "Bad Reputation" acclaim — turns 60 on Sept. 22, but she's no where near retirement. Known as one of the most influential women of rock, Jett is still producing albums and going on tour. She's young at heart and acknowledges there are advantages to being older.

"Some aspects of being young were difficult. Being too much in your mind. Even a rebel can worry about what people think about you, say about you," she shared. Now she can take a step back and go her own way.