What Does "The Double Standard of Aging" Refer To

What does "the double standard of aging" refer to?

A) Older men are more interested in sex than are older women because of hormonal changes.
B) Older women are more likely to reside in urban areas and older men are more likely to live in rural regions.
C) Evaluations of women's attractiveness and femininity decrease with age, whereas evaluations of men's attractiveness and masculinity are unaffected or
Even increase.
D) Sex outside of marriage is considered taboo for older women, but not for older men.
E) Older women are more likely to be widows than are men and therefore it is difficult for older women to repartner or remarry.