... and which ones are not.

Is your feature request related to a problem? Please describe.
Folks not involved with Core Python development might not know which Python versions are still maintained, and which ones are no longer maintained and not preferred anymore.

We have a release schedule listed at the bottom of python.org/downloads, I guess it was meant to indicate which ones will still receive new fixes, but it was not explicit in saying that the other ones aren't being maintained anymore.

Devguide has some more info about it, but casual users wouldn't land on that page.

Describe the solution you'd like
It would be great if we can clarify which Python versions are still maintained, and which are not.
The downloads page seems like a good place. Perhaps we can add some paragraph indicating which ones are still actively maintained, and which ones are not.
We also should state that unmaintained Python versions should not be used.

Additional context
See twitter thread: https://twitter.com/pydanny/status/1024302657161256960