Comment by miles

> You can stay on an older version for a little while, maybe a year at most until it stops getting patches.

Catalina should be supported for two more years:

https://computing.cs.cmu.edu/desktop/os-lifecycle

https://www.csun.edu/it/supported-operating-systems

https://www.reddit.com/r/sysadmin/comments/imdzv4/endoflife_...