Question: who is the oldest person living in the united states
Answer: The Gerontology Research Group ( GRG ) , an organization that tracks supercentenarians and validates longevity claims , has validated claims of over 700 American supercentenarians and as of 19 April 2018 , lists six verified living American supercentenarians , the oldest of whom is Delphine Gibson , born August 17 , 1903 , aged 114 years , 245 days .