Martha Stewart

[Curmudgeon]

Martha Helen Stewart (née Kostyra; born 1941 August 3 in Jersey City, New Jersey, USA) is an American business magnate, television host, author, and magazine publisher. (Wikipedia)

Someone had to do it, so here's Martha as the oldest Sports Illustrated swimsuit cover model, age 81:

[Curmudgeon]

... and here she is, about half a century younger