System Software for 13-inch, Mid 2012, MacBook Air
What's the highest macOS for a mid-2012 MacBook Air? (Currently running High Sierra, v. 10.13)
MacBook Air 13″, macOS 10.13
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What's the highest macOS for a mid-2012 MacBook Air? (Currently running High Sierra, v. 10.13)
MacBook Air 13″, macOS 10.13
Catalina 10.15.7. See the following from Identify your MacBook Air model - Apple Support
MacBook Air (13-inch, Mid 2012)
Model Identifier: MacBookAir5,2
Part Numbers: MD231xx/A, MD232xx/A
Newest compatible operating system: macOS Catalina 10.15.7
Also see: How to get old versions of macOS - Apple Support
Catalina 10.15.7. See the following from Identify your MacBook Air model - Apple Support
MacBook Air (13-inch, Mid 2012)
Model Identifier: MacBookAir5,2
Part Numbers: MD231xx/A, MD232xx/A
Newest compatible operating system: macOS Catalina 10.15.7
Also see: How to get old versions of macOS - Apple Support
I since read, elsewhere, that I might want to stick at Mojave, or I might have an incompatibility with some of the older, 32-bit, applications. Or, at least, check it out before updating to Catalina.
Correct, Mojave is the final MacOS that can run 32 bit Apps.
System Software for 13-inch, Mid 2012, MacBook Air