I'm 33, married, two kids.
I have never used Facebook but I do feel 'out of the loop.' especially since the baby arrived - I don't hear about things 'through the grapevine' and subsequently seldom find myself with many social options on the days that I have free.
This is good for my startup but bad for my self esteem.
I do have sort of a wife's account vector but tbh: she also starts feeling shit and creeped out after being in there.
It's ok, as the apologists are wont to point out, there is a choice.
Mine is made.