answer:I don’t think I notice an age trend here. But it seems that from 14 people start to complain. Teenagers complain about families and schools like you said. As people grow older their complaint become more “abstract”, like they complain about life, the goverment, youth… Not all of them are about “back then it used to be much better”, but more like “why the hell doesn’t it work like I want it to be?” By the way those who complain about the government tend to be delusional or need to get a life.