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So.....when we weren't looking, some of America's biggest rockers, actors, comedians, and other show biz types became gramma and grampa types who crossed over into their 70's...but you wouldn't know it by how they look, sound, or perform...Stevie Nicks is still hot at 73, Bruce Springsteen will be 72 next month...Samuel L. Jackson could pass for any number of ages, but he's 72...Steve Martin is 76!! See the list of 15 here: including Wonder Woman Lynda Carter, Steven Speilberg (who had his first blockbuster movie "Jaws" when he was 28), Suzanne Somers, Sigourney Weaver, and more, here.