Voter turnout for the 18-25 demographic was its highest in 50 years in 2020. Still not close to what the turn out is for the 65+ demographic though. There are about 50 million in that 65+ group, so I'm not sure if turnout is the main issue here given the population sizes and the popularity of the program across all those demographics.

I think as Lyn put it, it is a marketing issue. I don't think people know enough about how the program works to be able to vote accordingly. It probably wouldn't be nearly as popular of a program otherwise.