Her name was Anna Mary Robertson Moses, affectionately know as Grandma Moses. She was born on a farm in Washington Co., N.Y.
Without formal art training and largely self-educated, she began to paint rural scenes at the age of seventy-eight. Her work was discovered in 1939 by Louis Caldor, a New York engineer, who first saw her paintings exhibited in a drugstore window at Hoosick Falls, N.Y. In 1939 three of her landscapes were displayed in a private showing to members at the New York Museum of Modern Art among other works by contemporary unknown painters; in 1940 the Galerie St. Etienne in New York City presented her first one-man show. Thereafter Grandma Moses had more than one hundred exhibits throughout the United States, over half of which were confined exclusively to her work; since 1950 her paintings have been exhibited in Europe as well.
Amazingly she lived to be 101! I guess you're never too old to begin your life's most important work.