What ignorance this statement projects…as people age, especially those with a lifelong partner usually do not lose interest in sex specifically, the need to procreate just lessens as women's and men's hormones decline. Its actually a healthy thing to have a constant partner to engage in healthy sexual behavior…I know a lot of people who may not be in he prime of their life (your definition - old and fat) who have more sex than younger people of childbearing and youthful ages…the millennials are actually having less sex than previous generations and it creates more anxiety and fear with less one on one contact and more tech related communication.
Sex is not for everyone, but many have bought into the commercial definitions of what sex is supposed to be which to me is the root of the problem…..
Last but not least, my best sexual experiences had nothing to do with quantity but more to do with a combination of physical, mental and spiritual elements….take this how you like but live a little before you place judgement on others with something as personal and sacred as sexual love or relations.