I'm 71. Not on mumsnet but feel that having had a daughter at the age of 20 has influenced my outlook on life. I've always found I have more to discuss with others the same age as my daughter than I do with those the same age as myself.
I don't have much spare time and enjoy going on two threads here, in particular, every day but don't always make it.
I joined 5 months ago with the hope that I would find some 'real time' friends through the meet up forum. That's not been successful. It does depend on where you live I suspect.
It is lovely to see how much support there is on some forums and how some are missed when they haven't commented for a while. I think you'd have to be a long term, very regular poster for this to happen.
I was surprised at how much some posters know about each other and think quite a lot of PMs are sent, which must build up a more personal contact between some.