Updating older iMac OS
Can I update my iMac 14,2 (late 2013) from OS 10.13.6 to Mojave 10.14?
Question marked as
Yes you should be able to upgrade all the way to Catalina 10.15.7, however if you do please note if you use any 32 bit applications they will not run on Catalina. You will need to either upgrade or replace them with 64 bit versions. You can easily find out which of your apps are 32 bit buy launching System Information - Software - Applications and look for the column named Kind.
You can also find Mojave by using https://support.apple.com/en-us/HT211683