From a total population of 6,572, Gretna has a median age of 35.5. The average age of males, in Gretna, is 34.3 while the average age of females is 37. When you compare this to median age of Nebraska, Gretna is 0.7 years younger.
The median income of individuals, in Gretna, is $28,478 while the average household income is $69,713. When comparing the median income of people living in Gretna to the rest of Nebraska, the average income in Gretna is $1,139 more.