Wealth and genetics can take you a long way, but when a celebrity looks exactly the same as they did 20 years ago, we still have to wonder: what's the secret to their permanent glow? Have they discovered the fountain of youth, or is it something blatantly simple (like drinking enough water every day)? Here, the skincare and fitness habits that keep celebs like Jennifer Lopez and Reese Witherspoon looking 20 years younger.

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