"Happy wife, happy life," the old saw goes, meaning, obviously, if your significant other -- of either gender -- isn't upset, neither will be your living situation.

However, researchers at Tilburg University in the Netherlands tell the Association for Psychological Science that a "happy wife" can lead to a longer life.

Scientists at the university discovered  that keeping happy the one you're with is actually more advantageous to one's own longevity than keeping yourself smiling.

The researchers pored over data 4,400 couples over the age of 50; for context, 99% were heterosexual, and the couples were either married or living together.

Those who are unhappier generally live unhealthier lifestyles, and if that sounds like your partner, chances are you're doing the same thing, so as not to make waves. So if your partner is depressed and wants to spend the evening eating chips in front of the TV -- that’s most likely how your evening will probably end up looking, as well.

Conversely, if your partner loves hitting the gym -- or would rather binge broccoli than Netflix, you're more apt to follow along, to the benefit of your own health.