Some of this is just natural ---at age 15 or 16 kids start thinking about being adults, leaving their parents. They have to think they're rebelling but a lot of times, they're just doing exactly what they're parents are doing. How many of the parents showed by example it's very important to impress your peers --- driving cars they couldn't afford, living in upscale houses and trying to keep up or stay ahead of the neighbors?
That's just another symptom of the malady: 35-year-olds arrested at the 8-year emotional level.