After a certain age, being "sexually desirable" stops being as important as it once was.
Young women want to be desired, sexually. Because they're young and don't really have much else to offer.
As women age, they stop wanting to be desired (as much) and start wanting to be cherished.
We, as men, desire women for their beauty. But we cherish women for their virtue.
And there's not a whole lot of virtuous women (people) out there.