30-35: Sure, classes are still fine and are probably better anyways.
36-40: Eh, maybe towards the low range but if you're 40 you should most likely be your job by now.
41-45: Chances of you being better off as your class are slim to none, but there might be a special case for it somewhere.
46-49: You should absolutely be your job by now.
50: Lucky for you, there's no vote kick button yet.