Agree with wcr3d, for "basic use" you shouldn't have problems with general surfing, email, office applications.
My wife has a dead-ended 2011 MBA with High Sierra. It works for her basic needs.
I have a 2015 MBA running Catalina which I hope will migrate to Big Sur without problems. I am running out of hard drive space, which means vigilance to delete stuff and move stuff offline to an archive disk.
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