Maybe you have a trust fund. Maybe you'll have a wealthy spouse. But you never know when either one might run out. Don't mess too much with your hair or by the time you're 40 it will look 85. Be careful whose advice you buy, but be patient with those who supply it.
Advice is a form of nostalgia.
Dispensing it is a way of fishing the past from the disposal, wiping it off, painting over the ugly parts and recycling it for more than it's worth. But trust me on the sunscreen. Baz tracked down the origin of the words finding Mary Schmich the author, and the Chicago Tribune who retained the rights to Mary's work. Baz bought the rights from the Chicago Tribune, and the rest is history. The long term benefits of sunscreen have been probed by scientists, whereas the rest of my advice has no basis more reliable than my own meandering experience.