I can only think of 2 people in my inner-circle that are in the 30-40 range , 1 (male) has no kids 1 (female) does. Most of my inner circle is over 50 and most have adult children already on their own , so i dont have to worry about kids when i hang out with my peeps.
I remember when my wife and i were in our late 20's and 30's and would lose friends when they had kids. They would still send invitations for b'day parties and baby showers , but they quit going out to eat and getting together for games and hanging out. ...Oh well !