The average household size was 2.74 people and the average family size was 3.09 people. In the city, the population was spread out, with 26.8 percent under age 18, 4.6 percent from 18 years old to 24 years old, 23.2 percent from 25 years old to 44 years old, 27.8 percent from 45 years old to 64 years old, and 17.6 percent who were 65 years old or older. The median age was 42 years. For every 100 females, there were 93.7 males. For every 100 females age 18 and over, there were 90.8 males. The median income for a household in the city was $76,225, and the median income for a family was $83,691. Males had a median income of $62,351 versus $37,589 for females. The per capita income for the city was $37,292. 2.2 percent of the population and 1.4 percent of families were below the poverty line. Out of the total population, 2.4 percent of those under age 18 and 3.4 percent of those 65 years old and older were living below the poverty line. Fiserv is headquartered in Brookfield. The firm provides financial services technology (software, for the most part) for banks, thrifts, credit unions, securities broker dealers, leasing and finance companies, and retailers, among others. Its 2016 revenue was approximately $5.5 billion. Fedex's SmartPost business unit is also headquartered in Brookfield. Capitol Airport (02C) serves the city and surrounding communities. Brookfield has a mayor–council government. The mayor is elected to a four-year term. On April 1, 2014, incumbent mayor Steve Ponto again defeated former two-term Mayor Jeff Speaker by a vote of 4,512 to 2,539. On April 3, 2018, incumbent mayor Steve Ponto ran unopposed for mayor. Brookfield is represented by Jim Sensenbrenner (R) in the United States House of Representatives, and by Ron Johnson (R) and Tammy Baldwin (D) in the United States Senate. Brookfield is represented by Dale Kooyenga (R) in the Wisconsin State Senate and Rob Hutton (R) and Robyn Beckley Vining (D) in the Wisconsin State Assembly. The Common Council is composed of 14 aldermen, with two representing each of seven districts. They serve four-year terms, with one member from each district up for election every other year.