The first is an off the cuff question. I Googled it, but all I got was sites about how cursing is bad bad bad and children should never ever ever curse. About what age does the average school child start cursing among his peers? I'm looking more for ancedoctal evidence than statistical. I knew I picked up some of the milder ones in 4th grade, but stopped for a while and then picked it back up with fiercity in 8th grade. That's somewhat atypical.
Secondly, if a wheelchair bound person was driving a car/van, how would they get their chair in and out of the car? I know what the hand controls somewhat look like but not how they function or much else, especially since I can't drive.