California Democrat Dianne Feinstein’s announcement that she will seek a sixth term in 2018 puts the lawmaker on track to become the oldest female U.S. Senator in history. Feinstein – at 84 years, 3 months, 20 days – is already the second oldest woman to serve in the chamber behind Georgia Democrat Rebecca Felton who served briefly in 1922, exiting at the age of 87 years, 5 months, 13 days. If reelected, Feinstein would pass Felton on December 5, 2020 and would finish her sixth term at 91 years, 6 months, 13 days. The only other female senator to serve into her 80s is Maryland Democrat Barbara Mikulski who retired in January 2017 at the age of 80 years, 5 months, 15 days. To date, none of the 50 appointed or elected women to serve in the U.S. Senate died in office.