Whenever I experience writers' block, I like to read about other artistic souls who found new passions after age 50.
Frank McCourt wrote Angela's Ashes at age 65. The novel won a Pulitzer Prize in 1997.
Grandma Moses started painting at age 73.
Laura Ingalls Wilder published the first book of the Little House on the Prairie series at age 65.
Alfred Wallis took up painting at age 60. He needed a hobby "for company" after the death of his wife. His paintings are part of the Tate collection.