Part of the issue of age is many of us work on "obsolete" systems. Being able to troubleshoot and get help on legacy codebases is as valuable for me as when it was new 15 years ago.
At the very least stack overflow should require the version you are using. Python 2 and 3 is a mess on the website, as someone who isn't very great at python and can't easily spot the two versions. Even reading about inane stuff like tmux configs on the web is pretty crap since that syntax has changed several times as well. Version numbers should be required everywhere.