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. Several people have recalled that a few years back this graduation address was somehow mis-attributed to Kurt Vonnegut, Jr., much to his chagrin. The story goes that he was only partially quoted, or paraphrased, in his advice about sunscreen, and somehow the newspaper reports carried a story which sounded like plagiarism had occured. I know not what the truth is, and will be happy to abide by it if either author wants attribution.