Traditionally older people tend to have (or have had) more set schedules/defined work hours, more benefits (paid time off), and better job security in general. I'm not saying it's impossible for kids today to vote, but there are some disturbing trends in employment and the way workers are treated that I can see making it harder than it's been for previous generations.
Previous generations were able to support themselves at least enough to move out of their parent's homes. Young adults today are clearly struggling in ways that past generations haven't had to and that's going to strain how much time and effort they can spend on local and state politics.
Of course none of that addresses the larger issues like voter disenfranchisement and gerrymandering which limit the impact of voters making the effort seem less worthwhile.
I still think young people should do everything the can to get involved and vote, but I'm not going to pretend that any mention of their struggles can be dismissed by calling them "whiny entitled people"