You see it in Tom Brady and Roger Federer, who competed into their 40s. In Cristiano Ronaldo and LeBron James, still dominating in their fifth decades. You even see it at your local gym, where grizzled veterans hang with meatheads half their age. Which raises the question: What do they know—and how can the rest of us stay strong and athletic decades from now? First, the sobering science: We all get weaker, slower, and stiffer. Starting around ag…
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