Now scientists have come a step closer to saying it may just be true.
A study shows that if a spouse is admitted to hospital with a serious illness, the risk of death rises for the husband or wife.
And if the spouse goes on to die, the risk of the partner dying within a month is also significantly increased.
The study, carried out by American scientists, is the first of its kind to examine the so-called "caregiver burden," the effect of a spouse's illness on their partner and the increased risk of death.
Nicholas Christakis, Professor of Medical Sociology at the Harvard Medical School, said: "When a spouse is hospitalized, the partner's risk of death increases significantly and remains elevated for up to two years. Our study shows that people are connected in such a fashion that the health of one person is related to the health of the other.
"It also suggests that diseases that are more disabling are more likely to result in disease and death in the caregiving spouse."
Professor Christakis and colleagues from the University of Pennsylvania studied more than half a million couples over 65 between 1993 and 2001.
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