I've been married for 20 years to a younger man who just a few minutes ago said he certainly has not lost interest. I guess we'll keep waiting, but as I am in my 50's and he in his late 40's, it seems time may run out before we tire of each other. He also says that now that the children have flown the nest, I look about 20 years younger (that would be the extra sleep I get, I think).
As a descendant of Eleanor of Aquitane through my grandmother, my husband constantly reminds me that our line of women remains quite vibrant and lively until a very old age. My grandmother is 97. Her descent from the Plantagenets comes from both Col. James Taylor and Martha Thompson, as well as through the Thornton family (descended from Eleanor Plantagenet - the mother of Blanche who married Louis IX, through Blanche and the de Hollands/Greys). My mother, who is 72, still turns heads and has her suitors. My sister also married a younger man (and my mother did two, on her second marriage - an incredibly handsome guy although they were both too fiery and it didn't work out).
At any rate, I highly enjoy being married to a younger man (no one has ever dared tell us that we look different ages, btw - perhaps it's my Plantagenet temperament...) And, people who make blanket statements about age differences in marriage usually get told how we view things.
Henry was of course not prone to fidelity in the first place (although frankly, he didn't come close to his father's number of infidelities).
Katharine Hepburn (after whom we named our daughter, among other Katharines) was 61 (approximately) when she filmed Lion in Winter and I think she's too lovely for words and gives poor Alais/Jane Merrow a good deal of competition in terms of attractiveness. But then, character is part of beauty. At our house, we think the aged Queen Elizabeth II is quite an attractive lady, and the Queen Mother was cute and vivacious until 100. My husband says that Queen Elizabeth II's bearing and style have actually improved over the years and that she's more attractive than her daughter (so perhaps I should be worried that he'll run off with an older woman).