El truco para mantener unido el matrimonio

De un interesante artículo del WSJ entresaco este texto sobre cual es la clave para mantener un matrimonio unido:

My sister, a doctor, told me about one of her patients, a 92-year-old woman who showed up for her appointment with her husband, who is 94. They said they have been married for almost 70 years.

My sister, highly impressed, asked the couple the secret to their union's longevity. And they looked at each other for a long moment. Then the wife spoke: "Eh, neither of us died."

Fuera bromas, da algunas ideas que pueden ser de utilidad. Aunque la clave fundamental, ya se sabe, es Una.