The Living On A Prayer hitmaker, 47, regularly treats his receding hairline so he doesn't end up bald and often laments on what will happen to Bon Jovi  as he ages.  And the star admits he's unsure whether he will continue with his career in to his 60s, like Rolling Stones rocker Mick Jagger. He tells Germany's Reader's Digest magazine, "Let me tell you, I am so worried. I look at guys like Sting and think, 'Well, he's cool about losing his hair,' but I'm already losing a bit and I'm so aware of it. Someone told me that you have to regularly massage your scalp so I do that all the time. You look like a jerk but it's got to be worth a shot. "I find it hard to believe I'm 47 already, because I still feel like 18. I don't plan on being the next Mick Jagger and to keep on going till my late 60s. But at the moment I don't see a reason why I should stop". Singer Jon Bon Jovi, like millions of other men and women, do not want to lose their hair; however, massaging o