When you’re a kid or teen, you don’t think about the signs of premature aging. Instead, you focus on having fun and enjoying life. By the time you hit your 30s, though, you’re often faced with an uncomfortable reality: You’re getting older, and your body is beginning to show some wear and tear. At that point, you can simply accept your fate and continue doing what you’ve been doing. Or, you can take the proverbial bull by the horns and start thinking about ways to reverse (or at least mitigate) the signs of premature aging. Most people, naturally, do the …