Some people don't need a piece of paper to show their love and commitment for each other. If they been together 20 odd yrs, then they are more than likely gonna stay together for the rest of their lives, and don't see the point in going through the whole marriage rigamorole.

Another reason could be that some people change as soon as they have a ring on their finger. Again people that have been a couple for many yrs then get married, don't even last past their first yr, because someone's personality changes which causes problems.

I intend to get married in the future, I am 22 now and don't feel the need to rush. I only intend to be married once so I need to make sure it is for the right reasons and with the right person. I would get engaged at this age, but would definitely want a long engagement to get to know the person first. We would have to live together first as well.