The term Senator comes from ancient Rome. Many different
governments use that term for some of their legislators.
In the United States congress senators serve a 6 year term.
In this state's legislature, a Senator serves for 4 years.
As of 2014, there are about 40 United States Senators that have
been in office for more than 20 years. A Senator's term is 6 years
at a time, but they can return to the Senate as long as they keep
getting elected for another term.