Mary Martha Kelly (née Young) (7 June 1851 – 30 December 1964 ) was a verified American supercentenarian. She lived to the age of 113 years, 206 days. She was the world's oldest verified living person, following the death of Marie Olsen until her own death. She was the second oldest verified person ever, after Delina Filkins. She also held the title of the oldest person ever from the state of Michigan until Maude Farris-Luse surpassed her age in 2000.