I think it's the fact that those in their senior age are not as skilful with the internet compared to those who are younger. Those who know how to use it have probably learned all they can about lucid dreaming so why try and learn something which you already know? Another thing to note is that I seem to remember being told once or twice that as you get older you remember dreams less and less. It's a shame but I'd have thought if you keep up dream journaling and things like that then the skills wont leave you.

I know how you feel, it took me a good number of months to have my first proper one. Joined Aug 2011 and had that first proper one Jan 2012 haha. I seem to have found this alot harder than everyone else though, surprising considering I'm only 17