No, no they're not. The "be stupid early" plan is a major fail IRL. The idea that society will forgive you for it is proven wrong every day. When employers look for anything to disqualify you, that old FB post with you being stupid is made to order, or the arrest for DUI, or any of those early mistakes, are very handy. It's actually much harder to overcome early stupidity than it ever was in the past because the internet remembers.
The math of compound interest applies to a lot of things beyond your bank account. The earlier you learn the basics of something, the earlier you start doing a hobby, the earlier you start collecting RL 'achievement earned' points, the faster they will grow in later years. I would argue that THAT is the way to invest the freedom of youth. Try a hobby or learn something to see if you like it. THAT's ideal to do when you can easily move on to something else while those choices are entirely up to you. You will move on to college and a career with much more confidence that the path you are on is one you really want. YOLO is true. Why would you want to waste any of it?
I also want to call BS on the 'life ends at 30' advice here. You really think traveling is best when you have no money or skills? BS. You think no one >30 is physically active? More BS.