This applies to older people — you won’t feel like you’re 3 if you’re currently 23! — If you’re in your 60s, 70s, or 80s, wouldn’t it be great to feel 20 years younger? Imagine feeling like you’re in your 40s, 50s, or 60s again. It sounds too good to be true. That usually means it is. But in this case, it’s not. …