Does your society lift young people up or push them down?
I think people become fearful with age. They get a family, a job that pays well and a mortgage. It is both comfortable and high-stakes--and they don't want to shake it up. Perhaps, also subconsciously, they are afraid of anyone else changing it (i.e. young people)---and they actively set up systems to stop it. In my worst conspiracy-theory death spirals, I will think of the following:
Huge student loans will keep young people quiet and toiling for a long while. Vapid pop culture will occupy their exhausted minds. Aggressive marketing will eventually run up their credit card debt and depression. Ever-changing fashion and its association with personal relevance drains their funds and regard for the worth of others and the environment. Prohibitively expensive rent / homes will keep them dependent / unsheltered. The expectation of getting degreed in university will waste their time (in many cases). A political process they don't understand will keep them irrelevant. An education that does not teach nutrition or personal finance, will keep them enslaved by food corporations and banks.
I read recently that Italy is "increasingly becoming a nation of pensioners, ruled by pensioners for the sake of pensioners". Don't even get me started about Japan, where I live. Baby boomers, you've dominated us demographically. You are our parents. What is this?