From a total population of 171,691, Ontario has a median age of 31.2. The average age of males, in Ontario, is 30.4 while the average age of females is 32.1. When you compare this to median age of California, Ontario is 4.4 years younger.
The median income of individuals, in Ontario, is $18,601 while the average household income is $54,156. When comparing the median income of people living in Ontario to the rest of California, the average income in Ontario is $11,305 less.