Being sociable looks like a good way to add years to your life. Relationships with family, friends,neighbours, even pets, will all do the trick, but the biggest longevity (长寿) boost seems to come frommarriage or an equivalent relationship. The effect was first noted in 1858 by William Farr, who wrotethat widows (寡妇) and widowers（鳏夫） were at a much higher risk of dying than their married peers. Studies since then suggest that marriage could add as much as seven years to a man's life and two to a woman's.The effect holds for all causes of death, whether illness, accident or self-harm.Q:William Farr's study and other studies show that .