It's pretty natural for people to have prideful mindsets. Honestly, I'll admit to being pretty prideful myself a lot of the time. I don't think that it's youth in particular, but really just anyone. I think the reason why it seems like it's the youth in particular is because of what culture promotes in youth these days. I think it allows youth to feel like they can more freely unleash their prideful mindsets and not be frowned upon. The culture we seem to live in today (in the area of youths) seems to promote that you can act like a jerk/brat whatever and it's deemed as 'cool'. This is just what I see every time I turn the tv onto a youth channel or look at a youth magazine or whatever. Whereas in older times it was more frowned upon than it is now. I think elderly people are just more experienced at hiding their pride and wouldn't be caught dead acting as prideful as the youth on the outside, but that doesn't mean that they're not acting as prideful as the youth on the inside i.e. not listening to you, thinking they're better than you, ect. Pride is in everyone at one point or another. Honestly though age doesn't matter, people just have to realize to truly be able to learn they have to humble themselves. Another thing is, not to mistake confidence with pride. I would say confidence is performing without fear whereas pride is saying that you can't get any better cause you're already the best.
I hope I didn't overstep my bounds writing this because I would consider myself a youth in the sense that I'm not as experienced as people older than me and not nearly as wise. I say in a sense because I also like to think of myself as an adult in order to push myself to accept the responsibilities of an adult so that when the time comes for me to live on my own and have to provide for myself I'll be ready. Here this kind of explains what I'm getting at better than I can explain about being a youth and adult at the same time if you're interested: http://www.therebelution.com/blog/2005/08/myth-of-adolescence-part-1/