And it's not about compromising or putting your partner first ...
Marriage never really gets easier as the years march on, but the problems you face do change down the road.
In old age, health problems in particular can seriously affect a relationship in a negative way. Stress about medical bills, dealing with your own or your partner's unhappiness or physical stress from being unhealthy, the list goes on.
University of Chicago's Center of Demography and Economics of Aging found that it's important for older couples to stay sexually intimate in order to protect their marriage quality.
The findings came from analyzing data from 732 "couple units" that included 1,464 individuals between the ages 65 and 74 years old. An the results identified that sexual frequency positively correlates to relationship quality.
"Wellbeing in older age incorporates both psychological and physical wellbeing, as well as sexual wellbeing, which can occur at the intersection of those two," Amelia Karraker, a postdoctoral fellow at the Population Studies Center at the University of Michigan in Ann Arbor told Reuters.com.
Older couples that initially reported averaging to one sexual activity per month elevated their marriage quality after increasing the frequency of jumping into the sack.
The one hole in the research, however, is that it doesn't prove that the decrease of sexual activity also decreases marital quality. Perhaps it's that they don't know what they're missing?
Either way, it just proves that sex remains essential to your relationship happiness—and that's one thing that'll never get old.