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Edit: Additionally, Monterey will get security updates until mid-2024. That’s 7 years for your 2017 models, which is the most recent, and only impacts the 2017 MBAir.
Are you cherry picking? Check Sonoma compatibility list, only for iMac 2019 or later
https://www.macrumors.com/guide/will-my-mac-run-macos-sonoma/
No it isn’t?
You need a source because this directly contradicts you.
That is not under 5 years.
Edit: Additionally, Monterey will get security updates until mid-2024. That’s 7 years for your 2017 models, which is the most recent, and only impacts the 2017 MBAir.