Yeah? Find me a 40-year-old who can go to school, go to a part-time job afterwards, come home, eat dinner, go out hang out with their friends, come home and watch television, do homework, then go to bed but listen to two or three complete record albums while you're doing that all. And that's not including bathing and the hour the youth spend doing their hair everyday. There's a reason why older people have short plain hairstyles, they don't even have the time to comb it anymore.
It's true what they say, time goes quicker as you age. And not only that, it gets quicker and quicker every year.
All that time you're wasting now waiting to do everything tomorrow instead, you are not going to get back. Do everything you can do now, get that job, save, get that PhD, travel, get a girlfriend, make all the friends you can, get in a band and do anything and everything you wanted to because believe you me, even if you actually still somehow had the desire to do all this stuff when you're older, you won't be able to win all you can do is wake up cut a fart eat breakfast scramble to go to work come home eat dinner and go to bed. And that's if you're not married. If you're married have kids, you can just skip going to bed.