What does it mean to grow old together and have a happy marriage? How to explain the good marriage of growing old together?

2. The word "happy marriage" means a long-term wish for married couples, while "grow old together" means a good wish for newlyweds to grow old together.

Together, these two sentences are often used as greetings for newlyweds. Similar greetings include "many happy events with a full moon", "holding your hand and growing old with your son" and so on.