Many. For one, it seems to me, the younger generation is prone to live beyond their means. That's probably one of the biggest reasons why many young nowadays can't progress economically. Can't even save. They'd rather borrow money to watch a concert than save. 

But I'm not blaming them. In the modern times, there's just so many things to buy, to spend your money on. It isn't like this in the years of old. There wasn't even a movie to watch, no phone to buy. There was even no internet, water, electric bills to pay. My grandparents and their siblings all built their houses when they got married. Today, their grandchildren's families are growing bigger in rented apartments.