Final answer:
Mary Stoneman Douglas was born on April 7, 1890, and would be 133 years old in 2023; however, she passed away in 1998 at the age of 108.
Step-by-step explanation:
Mary Stoneman Douglas, an American journalist, author, and environmentalist notable for her staunch defense of the Florida Everglades, was born on April 7, 1890. Considering her birth date, she would be 133 years old as of 2023 if she were still alive. However, she passed away on May 14, 1998, at the age of 108. She is best known for her influential work, 'The Everglades: River of Grass,' which was published in 1947 and significantly impacted environmental policies concerning the preservation of the Everglades.