Sure, your body changes as the decades go by, but there's plenty of proof that good diet and exercise habits can override your chronological age . After all, a 25-year-old who subsists on junk food and shuns the gym doesn't score a free pass to a sexy bod—genetic freaks aside. Just as the 45-year-old who eats healthfully and makes it to spin class isn't doomed to get frumpy.
