The 19, 20, 21+ year olds that I used to supervise at work have the maturity and mentality of 8 year olds. Just pathetic. I had a 24 y/o worker come to me and tell me he was upset and wanted to go home early. I asked him what was the problem. "Those guys are talking smack about my favorite comic book superhero, and I can't take it." I told him to grow up and get back to work.
In comparison, my son bought his house at age 24. Proud of that boy!
