No. Political parties change their behavior to capture voting demographics. Right now politicians aren't motivated to win the young vote because we vote less.
Is there actual evidence of this occurring or is it just a hypothesis? I can’t recall offhand significant policy changes to capture voting demographics.
Maybe because voting demographics change so slowly, policy changes slowly too. Thirty years ago, when I was still in K-12 school, Baby Boomers were the largest generational voting bloc in the USA, and they still are. With a few exceptions that the rest of us are grateful for, it's been politically status-quo for pretty much my entire life.
Right, but I think you are making my point. Despite the boomers dominating for decades, we’ve seen the GOP swing far right relative to the 70s/80s. For example, Nixon massively expanded the Clean Air Act and enacted the Clean Water Act, which never would never have happened with the GOP in the last 30 years.