Carrie White, who was declared three years ago the "oldest living person in the world" by the "Guinness Book of World Records," died Thursday at a nursing home in Palatka, Fla. She was 116. Born when Ulysses S. Grant was president, Mrs. White spent 75 years at Florida State Hospital at Chattahoochee, where her husband, John White, admitted her one day after her 35th birthday. Hospital records say she suffered from post-typhoid psychosis, but doctors now are not certain of that diagnosis. She was released from the hospital when she was 109 as part of a program to move geriatric mental patients from state institutions. Guinness officials in New York said they are trying to determine who succeeds Mrs. White as the world's oldest living person -- and have plenty of candidates.