I used Cyanogen on my HTC Dream, the first android phone! It still only lasted a few years, because the tech was sooooo fresh. But it would have not lasted as long if I wasn’t using Cyanogen!
I’m an iPhone bitch now, and I’m typing this on a six year old iPhone that’s about to get a new software update. Still as fast as when I got it. I’m updating this year though, because I desire a 120hz screen and USB-C.