Banning those over 60 is a funny jab against an older generation who are susceptible to conspiracy theories and who are not media smart. They have lots of trouble differentiating sound and noise. I doubt this person was serious. Nevertheless, it was funny.
I can see how people overprotect it. There's been a systematic campaign against it since the 1930's with reefer madness and more propaganda that's deeply rooted in racism. Many older generations still share a very negative sentiment towards marijuana. It seems that some people over defend it given their experience with the negative connotation. It's still considered a schedule 1 drug by the federal government with no accepted medical use.