PLAINS, Ga. — Rosalynn Carter, the second-oldest U.S. first lady ever, turns 95 today! It is being marked with more than just cards and best wishes, but with butterflies.

Rosalynn has a fascination with butterflies dating back to childhood, when she was entranced by the colorful insects flitting around her mother's flowers in Plains, Georgia, longtime friend and neighbor Annette Wise said.

That interest led to the formation of the Rosalynn Carter Butterfly Trail, which was established in the southwest Georgia town after the former first lady grew concerned about the future of butterflies, which are crucial to the pollination of flowering plants.

Rosalynn was just 18 when she married Jimmy when he was 21 on July 7, 1946 in Plains. The Carters are officially the longest-married presidential couple!

Happy Birthday, Rosalynn!