The latest version of the Mac operating system, dubbed El Capitan, is going to be released tomorrow. Normally I'd put together a detailed post on whether you should upgrade depending on the age of your hardware, the software you use, and so on. David Pogue says there's no such consideration needed this time:
As a handy bonus, you won’t need to upgrade your Mac to run El Capitan. It runs on almost any Mac that can now run Yosemite, or Mavericks before it, or Mountain Lion before that.
A system-software version that still runs on 8-year-old machines? Nicely done, Apple.
If you’re in a hurry, here’s the bottom line: Download and install El Capitan. There’s zero reason not to. Everything runs just as it did before. I couldn’t find a single app that didn’t run perfectly after the installation. (Well, one: My favorite calendar program, BusyCal, went black during the “calendar page” turns, where there’d normally be an animation. An update fixed the problem.)