Well, I pass on this one, now I admit I'm simply too young.
"That happens when you have kids."
I can honestly say that this is far from the norm. My mom and her friends didn't change their lifes, they had to adjust, but they didn't change it.
My mom's still very active and has something to do almost every day (specialy now she got into zumba ....).
I guess you know how to make friends, so I shouldn't tell you that. And you're good around strangers. So just get yourself some.