We have a Late 2013 iMac that is only supported til Catalina. My colleague booted to Big Sur on one of our tester drives out of habit and… it just worked! Like
How to Install macOS Monterey on Unsupported Macs, for Security Improvements - The Mac Security Blog
macOS 11.0 'Big Sur' will natively support all Macs from mid-2013 to current, dropping support for all pre-Retina MacBook Pros and the first gen Retinas. : r/mac
Amazon.com: Apple iMac 27in Late 2013 A1419 3.5ghz 8gb RAM 1TB HDD El Capitan (Renewed) : Electronics
macOS Monterey will drop support for older MacBook Pro and Air models | Engadget
Apple iMac 21.5" Late 2013 Core i5 2.7GHz 8GB RAM 1TB HDD MacOS Big Sur 11.5.7 | eBay
Big Sur support on iMac late 2013 - Apple Community
Identify your iMac model - Apple Support
Breathe Life Back Into Your Late 2013 Or Older Apple Mac With Linux
Amazon.com: Apple iMac 27in Late 2013 A1419 3.5ghz 8gb RAM 1TB HDD El Capitan (Renewed) : Electronics
Late 2013 27" Retina iMac For Sale
List of Macs Compatible With macOS Big Sur - MacRumors
Apple iMac 21.5" All-in-One Desktop Computer Core i5-4570R 2.7GHz 8GB RAM 250GB HDD Mac OS Mojave Late-2013 w/ Keyboard & Mouse
upgrade advice for a late 2013 27-inch iMac | MacRumors Forums
Amazon.com: Apple iMac 27in Late 2013 A1419 3.5ghz 8gb RAM 1TB HDD El Capitan (Renewed) : Electronics
Apple A1418 iMac (Late 2013, 21.5 inch) Core i5 2.7GHz 8GB 1TB (macOS Mojave) | eBay
iMac 21.5-Inch "Core i5" 2.7 (Late 2013) Specs (Late 2013, ME086LL/A, iMac14,1, A1418, 2638): EveryMac.com
iMac (Late 2013) | Low End Mac
Apple 27" iMac Desktop Computer (Late 2013) Z0PF-ME0881 B&H
Apple iMac 27" - Late 2013 Reviews, Pros and Cons | TechSpot
iMac (27-inch, Late 2013) - Technical Specifications
Apple iMac 2013 Apple Desktops & All-In-One Computers for sale | eBay
WiFi, IO & The Chassis - 21.5-inch iMac (Late 2013) Review: Iris Pro Driving an Accurate Display
Which Macs will run Apple's macOS Big Sur? | Computerworld
SOLD - Late 2013 iMac 21.5" - $695 - Denver Mac Repair
How to Install macOS Monterey on Unsupported Macs, for Security Improvements - The Mac Security Blog
iMac | 3.5 GHz Core i7 | 27 Inch | Late 2013 - Techable.com
iMac (21.5-inch, Late 2013) - Technical Specifications
