Mine is still cranking, though it's recently relegated to couch duty as I use the 2019 iMac for WFH heavy lifting these days. I put a $29 upgraded WiFi module in it so that my watch will unlock it (and enables a bunch of other Bonjour functionality), but it otherwise just keeps humming along. I'm wondering if it isn't the computer I've kept and regularly used more than any other in the forty years since my first one.