Yeah I'm still using an iPhone 12 from late 2020 and it's honestly still fine in terms of its processing power, cameras, features etc. for anything I use it for. It does need a new battery but even that has degraded way slower than earlier phones I've had.

I was using an iPad Pro from late 2018 (mostly just for casual web browsing, reading documents and watching video on, I still do all my real work on laptop/desktops) as well until this year, and would have kept using it if I hadn't accidentally dropped it in water. I don't really notice much difference at all between my old one (when it worked) and the new iPad Air I replaced it with, except for the battery being a little better and having a bit more ram being nice (websites in background tabs are less likely to be purged from memory when I come back to them).