My very first thought when I saw that scene was that the old couple were just some people Betty had met on the plane. On long plane flights you often become friendly with a fellow passenger or two. They showed up at the end of the movie because Irene had told her, "I'll be watching for you!"
All the theories about them being Diane's "psyche" or whatever doesn't seem to match the rest of her dream in which all the characters in her dream were based on REAL PEOPLE. So it's safe to assume the old couple did exist and did meet Diane in real life at some point.
The moment when we saw the old couple grinning strangely in a car seems to confirm that they were just briefly acquainted with Diane. When you meet someone briefly, you only have a limited impression of them. Maybe the only impression Diane had of them was that of a happy smiling couple. If you dream about people like James Dean or Marilyn Monroe you always picture them as they were young and glamorous, because you never saw them any other way.
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