Everyone, which profession do you think the following description refers to?

1) It’s “eats youth”—as you get older, people will look down on you.
2) Work for a long time and you’re likely to get sick.
3) The money comes in fast.
4) If your skills are good, you’ll earn more.
5) For most people, the ideal is to make enough money and then stop working.
6) A small number of people, once they have lots of experience, don’t work themselves anymore—they switch to leading many younger workers.
7) There’s an extremely rare chance to directly leap across social classes.