That's not as true any more. I know a number of couples that "started late" and will be in their fifties just as their kids enter the ~10+ year old age range wh

That's not as true any more. I know a number of couples that "started late" and will be in their fifties just as their kids enter the ~10+ year old age range where after-school activities ramp up yet the kid can't drive. People having kids later is probably going to be another of those slow social changes we'll all have to adjust to.