I've given my 26 year old son all the pro-car arguments I can think of but he wants to take the plunge, sell his truck and go carfree. It should work out just fine. He's in college and has no dependents. He pays his own expenses and thinks he has better places to spend his money. But I think the major issue for him is the opportunity to get enough daily exercise to stay as physically fit as he was when he got out of the army.
I guess what made me decide to stop discouraging him was that he told me that lately, when he drives, his right foot twists a little as if it wants to unclip when he takes it off the accelerator pedal. I thought that was funny and it left me without a good comeback.