From a total population of 126,746, Mercer County has a median age of 44.5. The average age of males, in Mercer County, is 43.2 while the average age of females is 45.7. When you compare this to median age of New Jersey, Mercer County is 5.2 years older.
The median income of individuals, in Mercer County, is $50,846 while the average household income is $106,519. When comparing the median income of people living in Mercer County to the rest of New Jersey, the average income in Mercer County is $14,487 more.