They are hired in young, generally in their late teens and early twenties. They are energetic and excited about getting paid to do something they really enjoy (and probably have been doing on a small scale for years without pay). They tend to have more experience than you’d think, less than they think, and hopefully are able to take direction well.
That’s just the start of it. It’s ridiculous just how well the rules apply to both game developers and adult film stars. I want to know how someone thought this up!