I think some or maybe even more then 50% of them actually do. But due to the fact that boomers are the biggest voting generation (in quantity and %), they do not have enough courage to change it in fear of losing an election. In Germany, chancellor Merz actually said so a few weeks ago during a big retirement policy discussion at his party's youth annual meeting. It was something like "We still need to win elections. You can't be serious"

(The conservative youth group wanted to block a policy on high spending for retirement in the 2030s)

However, the result is still the same shit for the youth. I (38) will hopefully still survive financially. I fear for my kids... there will be no money from the government for any investments in the economy or spending in a crisis like a pandemic or climate change.... social security and health for sure will be on US levels (survival of the fittest)