The citizens of the U.S.A. with not less than 30 years of age can contest election to the senate. . The term of office for US Senators is 6 years; there are no term limits. A Senator may serve as long as the voters of his (or her) state continue electing him, provided he is not removed from office for misconduct. The US Senate is composed of 100 senators. There are 2 from each of the 50 states, regardless of population. They have to have been a U.S. Citizen for the past nine years. They must be a resident of the state which they want to represent, at the time of elections.