The old lovers can keep their relationship for so long, there must be a secrete. It is love, they all look alike and feel alike.

good observation... I come to notice this phenomenon when I'm looking at their offsprings as if finding out who between their parents they look most. In the Holy Book, it says that "when two bodies are joined together for love, they become one." Maybe, this is one among the reasons to answer your question. :)

A study published in the March 2006 issue of "Personality and Individual Differences" may have the answer. Twenty-two people, divided equally between male and female, participated in the study. They were asked to judge the looks, personalities and ages of 160 married couples. The participants viewed photographs of men and women separately and were not told who was married to whom. The subjects consistently judged people who were married as being similar in appearance and personality. The researchers also found that couples who had been together longer appeared more similar. This in itself may not seem surprising, but the study also offered some answers on why couples may look alike. To start, consider that life experiences can end up being reflected physically. Someone who is happy and smiles more will develop the facial muscles and wrinkles related to smiling. The years of experience of an old couple's marriage, happy or otherwise, would then be reflected in their faces.

agree to sean! let me get old! now i am enjoying youth!

They say that people who have lived together for a long time start to look like each other because they are so familiar with each other's way of speaking and habits.