From a total population of 29,089, Foster City has a median age of 40.7. The average age of males, in Foster City, is 38.9 while the average age of females is 42.1. When you compare this to median age of California, Foster City is 5.1 years older.
The median income of individuals, in Foster City, is $55,318 while the average household income is $114,651. When comparing the median income of people living in Foster City to the rest of California, the average income in Foster City is $25,412 more.