From his career-making turn as Robert Young's right hand on Marcus Welby, M.D., to his latest film-directing project, Brolin credits his longevity in Hollywood to keeping his cool. "Stress can take years off your life," says the father of actor Josh Brolin, 44 (and father-in-law to actress Diane Lane, 47). "I don't get rattled about many things." It can't hurt that he lives with someone equally familiar with the vagaries of show business: his wife of 14 years, Barbra Streisand, 69. That, however, may be where their similarities end. "She thinks everything has to get done right now," he says of his beloved, a notorious perfectionist. "My theme is, 'What's your hurry?'"
Champion Athlete, 59
Back in the '70s, Andy Mill was America's top downhill skier. But he really peaked when he traded chills for gills: He won his first of five World Series of Tarpon Fishing cups in 2000. "Being great is one thing," says Mill, "but being the best in the world is another." These days, Mill loves to fish the Florida Keys, near the home he shares with his third wife, Debra (second wife was tennis champ Chris Evert). And although he still has aches from the horrific back- and neck-breaking crash that ended his ski career, he doesn't plan to relax. "I'm 60 going on 6," says Mill, who skied in two Olympics. "I look outside and think, 'What mountain can I climb? How fast can I go?' "
Chicago-based paleontologist Sereno has discovered more than two dozen new species of dinosaurs, plus SuperCroc, history's largest crocodile. But it's not just sifting sand that keeps Sereno buff; he regularly performs the same number of push-ups as his age. ("It gets harder with each passing year," he admits.) To counter the blazing rays of the sun while on expeditions in Tibet and the Sahara, he slathers on moisturizers. "I should look like a dried prune," he says. Sereno's not shy about using his stud status to help promote interest in science: "If you can communicate well, and your looks help to inspire young people, then use them."