The OS of my trusty 2010 Mac Mini cannot be upgraded, but it still works for me after various hard drive and RAM upgrades over the years. These days, I’m mostly using it for email (no issues of course), websurfing, Fujitsu Scansnap to Dropbox, and Excel and Word (2011 versions). My two other Macs, a 2012 MacBook Pro and a 2014 Mini can both run Mojave.
Should I bite the bullet and buy a new Mac? Should I use this Mac Mini until it dies? Or donate/sell the old Mini (or keep as a entertainment server) and use the Macbook Pro until it can no longer be upgraded?
Incidentally, the reason I have 2 Mac Minis is that I live in the US and Mexico, and keep keyboards, mice and big monitors in my homes in both countries. All I carry back and forth annually is the Minis. Much cheaper than two laptops. The Macbook Pro was for traveling, but now when I travel, my iPad Pro (or even my iPhone) is all I need.
I’m probably in a different boat than most MPU subscribers. I’m retired, live much of the year in Mexico, and teach computing and photography to teenagers in rural schools (see www.thesanmiguelnews.com). So I’m using my computer a lot less than the rest of you.
BTW, there is a Mac Group in my town in the mountains of central Mexico (San Miguel de Allende). We have monthly programs, and if any of you are visiting, feel free to contact me for information.