I strongly suspect the answer to "do you see a lot of children around" depends heavily on neighborhood.

Much more accurate to say Walnut Creek / Tri-Valley as far as the East bay goes.

What do you do, just walk back and forth between Temescal and Uptown? If you look at the actual numbers, 21% of Oaklanders are children and 25% of households include a child.

http://www.bayareacensus.ca.gov/cities/Oakland.htm