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. The economists can't help noticing that the statisticians only buy a single ticket, where they bought four. After he's gone, the statisticians emerge. At the station on the way back from the meeting, the economists buy only one ticket, but they can't help noticing that the statisticians don't buy any.