Being in my mid-30's - not many of my acquaintances / friends use it too much any more now either.
The ones of my friends who do, are mainly self-avowed socialists / communists, or fairly far to the right of the spectrum. The (majority) of people whose political opinions seem to range from 'a bit tory' to 'a bit labour' via 'don't really care; they're all bellends' don't use it much.
I mainly go on to facebook now to poke people spouting anti-vaccination or pseudoscientific nonsense.
I hope Facebook withers & dies - great idea; good execution; not great side effects.
Also every third post in your feed now is an advert.
The surest way to kill a platform is to make it so ridiculously commercial.