People Waste their Youth on & Regret later in Life

There's a popular adage in my culture. It goes something like; "You can always wear your clothes anytime you buy it." The meaning is that whenever you wake up is your morning, whether it's 6AM or 1PM. In other words, you can do anything at any time you want and it will still be fine.
I don't agree with this line of thinking. In fact, I believe the opposite. I believe that people should take care of their youth because that's where the gold lies. I've seen people struggling so hard to do in their 40s what I did as play when I was in my 20s. I've seen people being overcome and paralyzed with extreme fear in their 50s, about what I did without even thinking about when I was in my 20s. And that's why I advocate that people should pay close attention to how they spend their lives when they are still young because, regardless of whatever anyone says, the older you get, the less you can do with your life because the more cautious and careful you tend to become