The details (2.9gHz, Quad Core Intel Core i5, 16 gb 1600MHz DDR3)
iMac 27″, macOS 10.15
There is no macOS upgrade path for the iMac 2012 beyond Catalina 10.15.7.
That is the newest version that will run on that computer.
You can use the computer as long as you like. It will continue to work until something breaks.
Catalina 10.15 is the highest macOS that a Late 2012 iMac can run.
If past history follows suit, Catalina should be supported by security updates for at least another year or two.
Sadly if you want to upgrade to a later and newer macOS (Big Sur, Monterey and beyond), then you will need a newer Mac.
Hey there!
Please elaborate your question a bit more to receive better help!
:)
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What happens if I have Catalina OS and an iMac 2012?
