credit apps solstice... that and what i do for a living is build a relationship, so i ask questions... every little thing they say tells me a bit more about themselves. if they are upside-down, they will be financing, so not only do we ask some of those things, we MUST ask them...
schooling part, that one is tougher... but i still find ways to find out things like that for a lot of them. usually talk about myself, and they offer their own history after.
anyway, it seems to be very widespread, but not many in the 60 and over category... the very upsidedown (multiple times they have done the trade-up thing) tend to be give or take 40... the 20-somethings are usually bad, but they are just in a new car they spent too much money on, so at least they can still ride out the loan with a reliable car that they loved not long ago...
the older ones have usually had their hands forced to get a car they don't really want because the numbers worked to get a payment they needed (think; 15k upside-down, so they get a base van with lots of rebate to hide as much negative equity as possible)... so they hate the car. the next time they want out, it is either impossible, or they get into something even worse (the two ways are a higher payment, or an even cheaper car, usually used with more flash, but something screwy like abnormal high kms, former accidents, etc)...
no real education difference... people with good jobs, bad jobs, high school education, doctors... everyone does it, they just do it for different reasons.