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There are families and kids in SF. They are not in the places where you are hanging out.
Idk- but I got the idea you were visiting or commuting, not living there. The residential neighborhoods have more kids. Not as many as other cities but there are families.
I live in Glen Park. Used to live in SOMA and Bayview.
It’s probably just my knee jerk reaction to a lifetime of people acting surprised that people can even grow up in SF or have children there. 
Many adult transplants are oblivious bc they live in neighborhoods without family housing.
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