4.0 % of the population and 3.0 % of families were below the poverty line . 4.7 % of those under the age of 18 and 8.3 % of those 65 and older were living below the poverty line . About 3.0 % of families and 4.0 % of the population were below the poverty line , including 4.7 % of those under age 18 and 8.3 % of those age 65 or over .