This 1957 ad for an Exercycle tells young and old women and men exactly what they should be concerned about:

So old women are supposed want to be young, young women want to be slender, young men want to be strong, and old men want to be active.  I think it’s pretty much the same today.

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Lisa Wade, PhD is an Associate Professor at Tulane University. She is the author of American Hookup, a book about college sexual culture; a textbook about gender; and a forthcoming introductory text: Terrible Magnificent Sociology. You can follow her on Twitter and Instagram.