Are old married couples unhappy?

I've been very happily married for almost 30 years to the same guy. Neither of us is bitter. We have an argument once in a while like anyone who lives together would, but mostly we get along great. He is loving and caring, so I don't need to fantasize! I think people need to realize that no one is perfect and just accept the flaws the other person has. Focus on the good things. Hold hands. Tell each other "I love you" every day.