Old Dells are fine
I've got an old Dell D820 (yep, 2008-ish), and upgraded from XP => Windows 7 => Windows 10 Pro. I replaced my wife's laptop with an SSD as 40+ chrome tabs were a problem, and I got her old HDD, and the D820 is reasonably usable even with only 4 GB of ram (it doesn't support more).
I'm not trying to lose it as it has a 1440x1200 screen, which is bigger than many new laptops, so meh. keeping it as it works quite well, and handily handles a 1TB HDD. Works for me