If there was a date baked-in to the interpreter that many of my students have, in 8 years I could ask everyone to run a command to see when their default python interpreter is supported until.
Telling them to trust me on the supported versions or going to a website that lists the end of life date feels a bit less definitive somehow.
I suspect they may be more likely to convinced to upgrade if the interpreter had its own end of life date baked-in.