allen.biggins wrote: How does one keep up with this moving target? Do I need to remind myself to look at that web page from time to time to check what the expiration date of the Mint version I am using?
Like austin.texas said, at the end of May, Mint 17 LTS will be available. If I'm not mistaken, LTS versions are supported for 5 years. So once you install LM 17, you'll recieve updates until 2019. Non-LTS versions are supported for 9 months only. Some people love installing a new system every 9 months, so...
If you're not one of them, then stick to the LTS versions, Allen.
The release cycle looks like this: 3 non-LTS - then LTS - 3 non-LTS - LTS, i.e. every fourth version is LTS.
In the past, LTS versions were supported for 3 years, non-LTS ones - for 18 months. That's why Mint 15 became obsolete earlier than Mint 14.