My MacBook Pro from Late 2012 still runs like on its first day.
My first gen Apple Watch on the other hand was dead on arrival (so slow, Steve Jobs would have never allowed it)
I'm using my 2008 Macbook Pro right now. With a faster drive in it, it's not bad at all for daily tasks and even older games (been playing a lot of C64 emulated games on it this trip). With the newer Firefox and/or Chrome, browsing is actually faster than it was say 4 years ago.
My Quad Core i7 Mac Mini Server with RAID0 still feels great as well 6 years later. With a solid state drive, it would scream for most tasks. Only newer games (most of which don't support Mac anyway) would be an issue on it and if they would ever get good support for external graphics cards at a reasonable price, that might be improved easily as well (there still isn't a good Mini replacement for the 2012 server models to this very day).