Georgia O'Keeffe died at age 98 in 1986.
She was born in 1887 and died on March 6, 1986, in Santa Fe, New Mexico. Her long life spanned the development of American modernism from the early twentieth century through the postwar era and into the 1980s.
O'Keeffe remained an active artistic figure for decades, though failing eyesight affected her ability to work late in life. She is remembered not only for individual paintings but also for sustaining a distinctive artistic identity across changing movements and markets.
The age can be checked by comparing her birth year with her death year, but the exact birthday had already occurred in November 1985, so she was 98 when she died in March 1986. She was not yet 99.