I have a lot of computers that I'm not using. When it comes to laptops, my upgrade cycle has been about every three years. The improvements from one to another are often marginal, though battery degradation is usually an issue. My desktop cycle is much longer. My late 2009 iMac I used until late 2015, so that was six years. It became Simon's computer. I replaced it with another iMac, and I used that until early 2019, so about four years, and that went to Simon while the old one I gave to one of his former teachers. At that point I built a Windows desktop, and I suspect that will last me at least another three or four years.
But most of the laptops are still hanging out. I have my 2012 MacBook Air still, which is sitting in my cabinet. It can still act as a build agent for iOS apps, which I admittedly don't make unless it's out of experimentation. That one had its battery replaced at some point after moving to Florida. I have a Surface Pro 3 that I bought in 2014, which was never my daily laptop, but I used it when traveling and going to clients for work because it was nice and small. The same year I bought a 13" MacBook Pro, and that was my daily driver until early 2018. That is currently Diana's laptop, so she's using a 7-year-old machine. That was the year I switched to Windows, and I bought the HP Spectre. I used that one until last spring, when the battery life got particularly terrible, and I was always annoyed at how warm it would typically get. I replaced it with the Surface Laptop 4, which I adore because of the goofy Alcantara fabric. It never gets warm, and even with a big developer load I can get 6 or 7 hours of battery life out of it, more with benign web browsing.
Note I still have all of those laptops. The Air I'll hang on to. The Surface Pro 3 I almost never use except to drive the lasers when we have raves at home. (Or a New Year's Eve party, which last happened December 31, 2019.) Like I said, Diana is still using the MacBook Pro. Yesterday, I bought a $45 battery to replace the failing one in the HP, and now it works like a champ again, though it gets a little warm still. Not sure what to do with that one. I could give it to Diana, but at this point I think she prefers Macs, and she really deserves a new computer. She says she might be content with a ChromeBook.
I think I might donate the HP, because someone can easily get another three or four years out of that thing. The rest, I'm not sure.
The funny thing is, I remember that laptops were really shitty back in the day unless you spent a ton. The Sony VAIO I bought in 2000 I remember paying at least $2,500 for (with 64 megabytes, not gigs, or RAM). Then in 2005-ish I bought an HP to tote around for consulting, and it was shit. The power connector came loose, and I had to solder it back into place. I only had that one for like two years, when Apple flipped to Intel.