...their wives depend upon them emotionally and see them as a source
of strength. And it's not just a little longer they will live; it's six full
years longer. Why? Someone who is relied upon feels more valued and therefore
more useful. Put more simply: There's a reason to keep living. But there's
a catch. A big one. If a husband thinks of his wife in the same way--as a
confidant and source of strength for him--he is likely to die earlier.