I don't have scientific data, but based on my own income, I would say that real income (i.e. quality of jobs) declined for ALL age groups, not just for the young, and this seems to be the core of trumpism.  I'm not a supporter, but I feel that I have to work more for less (in terms of buying power) than  20-25 years ago.  ... not to mention all the unnecessary xxx that is thrown at us by the corporate leadership...