One thing that would be interesting to add to this is the region where each of us grew up/went to college. Most of my friends who grew up in Chicago caddied during the summer, but I don't know anyone that I grew up with in Southern California who caddied while growing up. I don't even know of any caddy programs for high school aged kids at private courses in Southern California, assuming caddies are even available. I suppose that's largely based on the fact that in SoCal, the golf season is 12 months long, while in the Midwest, the golf season largely lines up with summer vacation. The few times I played with caddies or forecaddies in L.A., they were definitely not students. I did work at a golf course in college and for a couple years after, but caddying wasn't really an option.