It happens when getting married without proper planning. It doesn't matter at what you get married just make sure that you can adjust your life and have savings to start a new life. You cannot live happily and content when you do not know when to get financial to support everyday living. You have to prepare yourself for the big change in life.
When the marriage is new, people are so excited with it but then if they do it just because of their overwhelming feelings and no proper planning then they are heading to rough road. If they would be able to think of the solution though so that they can again go to a smoother road then that would be good but others cannot take the challenge that's why they become poor while those who persevere would be able to improve their financial status and it doesn't matter if they are young or old.