The generation that thinks that remembers when WWW was a new service next to stuff like SMTP and FTP and NNTP. Why wouldn't you put www to distinguish it? It's the new crowd that forgot or never knew about all the other stuff going on behind a domain and wants to hide away all the useful signals.
I was more talking about people that just start typing www when entering a URL. I see it a lot, perhaps more in older people indeed, but certainly mostly in non-techies. Recently I set up some websites for pensionados with a startup, they found it weird their website didn't start with www and asked me to add it.
