Earlier quoted context omitted.
Or in my case, a 2012 MacBook Air. I hope they'll support Catalina for another three or four years or at which point it's more than a decade old and can finally mature into a laptop's final stage of life as a Linux machine.
They tend to support OS releases for three years. Catalina EOL is likely to be sometime in 2022.
Still, decently satisfied with ~10 years of software support for a laptop.