What you need to run macOS Monterey
Apple's macOS Monterey was announced, and several Macs won't be able to run the operating system when it is released in the fall of 2021. Here are the compatible Macs.

Run macOS 12 on these Macs
Mac compatibility for macOS doesn't have as easy a through-line as iOS due to the variety of processors available. Apple is amidst a chipset transition to its custom Apple Silicon, so compatibility is more in question than ever.
Stay on top of all Apple news right from your HomePod. Say, "Hey, Siri, play AppleInsider," and you'll get the latest AppleInsider Podcast. Or ask your HomePod mini for "AppleInsider Daily" instead and you'll hear a fast update direct from our news team. And, if you're interested in Apple-centric home automation, say "Hey, Siri, play HomeKit Insider," and you'll be listening to our newest specialized podcast in moments.

Run macOS 12 on these Macs
Mac compatibility for macOS doesn't have as easy a through-line as iOS due to the variety of processors available. Apple is amidst a chipset transition to its custom Apple Silicon, so compatibility is more in question than ever.
Macs compatible with macOS Monterey
Mac Desktops:- iMac Pro (2017)
- M1 iMac (Retina 4.5K, 24-inch, 2021)
- iMac (Retina 5K, 27-inch, 2020)
- iMac (Retina 5K, 27-inch, 2019)
- iMac (Retina 4K, 21.5-inch, 2019)
- iMac (Retina 5K, 27-inch, 2017)
- iMac (Retina 4K, 21.5-inch, 2017)
- iMac (21.5-inch, 2017)
- iMac (Retina 5K, 27-inch, Late 2015)
- iMac (Retina 4K, 21.5-inch, Late 2015)
- iMac (21.5-inch, Late 2015)
- Mac mini (M1, 2020)
- Mac mini (2018)
- Mac mini (Late 2014)
- Mac Pro (2019)
- Mac Pro (Late 2013)
- MacBook Pro (13-inch, M1, 2020)
- MacBook Pro (13-inch, 2020, Two Thunderbolt 3 ports)
- MacBook Pro (13-inch, 2020, Four Thunderbolt 3 ports)
- MacBook Pro (16-inch, 2019)
- MacBook Pro (13-inch, 2019, Two Thunderbolt 3 ports)
- MacBook Pro (15-inch, 2019)
- MacBook Pro (13-inch, 2019, Four Thunderbolt 3 ports)
- MacBook Pro (15-inch, 2018)
- MacBook Pro (13-inch, 2018, Four Thunderbolt 3 ports)
- MacBook Pro (15-inch, 2017)
- MacBook Pro (13-inch, 2017, Four Thunderbolt 3 ports)
- MacBook Pro (13-inch, 2017, Two Thunderbolt 3 ports)
- MacBook Pro (15-inch, 2016)
- MacBook Pro (13-inch, 2016, Four Thunderbolt 3 ports)
- MacBook Pro (13-inch, 2016, Two Thunderbolt 3 ports)
- MacBook Pro (Retina, 15-inch, Mid 2015)
- MacBook Pro (Retina, 13-inch, Early 2015)
- MacBook Air (M1, 2020)
- MacBook Air (Retina, 13-inch, 2020)
- MacBook Air (Retina, 13-inch, 2019)
- MacBook Air (Retina, 13-inch, 2018)
- MacBook Air (13-inch, 2017)
- MacBook Air (13-inch, Early 2015)
- MacBook Air (11-inch, Early 2015)
- MacBook (Retina, 12-inch, 2017)
- MacBook (Retina, 12-inch, Early 2016)
Macs removed from compatibility with macOS Monterey
Mac Desktops:- iMac (Retina 5K, 27-inch, Mid 2015)
- iMac (Retina 5K, 27-inch, Late 2014)
- iMac (21.5-inch, Mid 2014)
- MacBook Pro (Retina, 15-inch, Mid 2014)
- MacBook Pro (Retina, 13-inch, Mid 2014)
- MacBook Pro (Retina, 15-inch, Late 2013)
- MacBook Pro (Retina, 13-inch, Late 2013)
- MacBook Air (13-inch, Early 2014)
- MacBook Air (11-inch, Early 2014)
- MacBook Air (13-inch, Mid 2013)
- MacBook Air (11-inch, Mid 2013)
- MacBook (Retina, 12-inch, Early 2015)
Stay on top of all Apple news right from your HomePod. Say, "Hey, Siri, play AppleInsider," and you'll get the latest AppleInsider Podcast. Or ask your HomePod mini for "AppleInsider Daily" instead and you'll hear a fast update direct from our news team. And, if you're interested in Apple-centric home automation, say "Hey, Siri, play HomeKit Insider," and you'll be listening to our newest specialized podcast in moments.
Comments
I've read that there are ways to run later macOS on older Macs, but it hardly seems worth the effort. How did you get Catalina on your old Macs?
But be sure to read up on it as there are certain things that simply won't work that the OS and apps running on Catalina assume you have with this demarcation point. For example, if you use Zoom you'll also have to do a bit of a dance because your Mac doesn't support Metal.
While I find dosdudes solution intriguing, I am not willing to deal with compromises and qualifiers regarding what works and what doesn't work. At least with High Sierra, I know where I stand, and it is 100% reliable as far as it goes.