I'll agree with the first bit, most definitely. The second bit, I dunno. Age happens to everyone at an equal rate, regardless of what you've done with your life. You don't even have to leave your house. :P
Gage Case grades reflect how committed you are. Whether that be committed to doing good work, committed to being a kiss ass, or committed to being apathetic.
Age always equates to experience. I'm not saying that it is experience in anything in particular, but someone who is a laze ass and is 50 has a lot more experience at being a laze ass than a 24 old mechanic has with cars.