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Have you noticed that human behaviors vary a lot in regard to staying healthy, as well as feeling young? These two are often correlated, but not necessarily. Mick Jagger looks as if he were in his 20s when he performs onstage. Some individuals, on the other hand, start looking and feeling old already in their 30s. Some try to stay up-to-date with the fashion, some try to learn the slang of the younger generations, and being active has become a norm.