Yes. The time to fix your health is now. Any unhealthy habits put time on the biological clock, and they'll just get harder to undo later. This is true if you're 20, 40, or 60. Plaque even starts building up on the arteries of healthy teenagers. It all adds up.

But don't read this and panic or beat yourself up, that's a waste of energy. That's choosing the punishment instead of the fix.

Instead, quietly start doing one small healthy habit. If you stop, don't revert to self-punishment again. Just quietly get back to it. Stubbornly persist until you've won.