(Not speaking for all younger people of course)
I often enjoy learning about issues in the past or why some decision was made the way it was.
Often this is best conveyed by people who have the context from having been involved at the time.
I have asked some people in the past for context to historical issues or decisions etc. (both in networking and other parts of tech)
(not directed at anyone specifically)
I think for the people who are concerned about the younger generations not having this knowledge, think of how to fix it rather than just giving up on the younger generation.
Sure not everyone will be interested in historical context, and certainly not in every topic, but some are.
I think connecting with the younger generations in order to answer these questions is a much better approach than blaming them for not wanting to use mailing lists or whatever.
Once again this was not directed at anyone specifically, just things I wanted to address from this thread as a whole.
-Cynthia