I believe I know the answer to this, but thought I'd ask in case I'm wrong. I have a Macbook Air 2014, running Big Sur. From my reading this can't update to Monterey, also running software update doesn't offer the update.
However every now and then the App store offers me the update? Surely it checks if a machine is compatible before offering the update?
However every now and then the App store offers me the update? Surely it checks if a machine is compatible before offering the update?