Grandma Moses Day, also known as National Grandma Moses Day, is observed worldwide every September 7 to celebrate the legacy of Anna Mary Robertson Moses, an American folk artist who began her painting career at the age of 78. The day honors her belief that it is never too late to try something new and change one's life. Born on September 7, 1860, in Greenwich, New York, Grandma Moses gained fame for her simple and realistic depictions of rural life, creating over 1,500 paintings throughout her prolific career. The holiday was established in 1960 by New York Governor Nelson Rockefeller to commemorate her 100th birthday. Celebrations typically include learning about her life and artwork, exploring her paintings, and encouraging individuals to take up new hobbies, reflecting her inspirational journey in art.