The hypocrisy here is not only one person speaking as a self-selected envoy for all Millennials and that everybody older than 35–37 (the definition of Millennials vary) is called “old”.
Indeed, it would be great to support and elect younger politicians, we can’t have a government which is out of touch with the rest of the demographics. Obama was 47 in 2008. As the French elected Emmanuel Macron, 39 in 2017, in 2020 we have a chance to elect a Millennial president.
But no, let’s drool over a 75 y.o. candidate, and when he doesn’t win let’s complain “I can’t stand old politicians”.