I am not sure what age I think is too old. It really depends on the person (more of a personality thing vs age thing). Yes and no to being in your mid thirties.
If you are really in Seattle, you will most likely fit right in and not feel old or young. My friend moved to a small town in a southern state and felt like an old mom (she was 34 for her last kid).
I know several profession moms who had the first at age 36 and the second at 38. Many doctors say after age 38 it when it really gets harder to become pregnant.
Several others are in their mid-late 40's in the kindergarten class. There are few mothers under 30 with a kinder child.
I think 43 is the age that is the oldest out of my friends to deliver a baby. I do not know it the child was naturally conceived.