OK got carried away with the above reply and forgot to answer the OP's question.
DD #1 was recruited for her job and started working at age 15
DD #2 just started training and will basically take over her older sisters' job in the fall.
DD #1 will be moving away to attend college
DD #2 is 15
They work at a sports center that has classes in gymnastics, dance, cheer, plyometrics, and martial arts.
My girls were both competitive gymnasts, have dance experience and both made their HS cheer squad... so the job is perfect (they just can't fill in for the martial arts coaches)
In a way they're very lucky since neither had to go out and submit applications and go through the whole interview process, but they also missed out on gaining that experience, which is valuable.
I'll end up needing to drive DD #2 to and from work for about 2-3 months before she gets her DL (about the same amount of time I did with DD #1)
That's the only part I have not liked.
They get paid very well, keep in shape on the job, and work with some really fun kids.
It's been great for DD #1 and I hope it will go as well for DD #2.