A lot of the far right are millennials and Gen Z. While the proportions in different generations are different, this isn't purely a generational thing. The implied message is that we can "wait them out," but that is basically just the same as doing nothing. We can't do nothing. We have to motivate people to vote, and then get them to volunteer and have them get others to vote.
If that's what the map would look like if younger generations voted like 65+, then go get those people voting so we get that map next election.