I married my first wife when she was 18 and I was 20. We went through a lot of hardship. It should not have worked out: we were both poor, from broken homes, in an LDR from different worlds. She was the popular girl, I was a shy and awkward nerd. When we got married, we had only been in one another's presence for a few weeks total. I went into the marriage not expecting a path or plan, as my parents were toxic which ended with my mother's suicide, and my mother in law had been married 4 times before she became single for the last time. None of us had healthy marriages to draw from. At our wedding, her relatives even said, "I give it two years, tops." We were desperately poor, and struggled most of our marriage with health and money issues.
But we made it work for 25 years. We'd still be married, but she passed away ten years ago. We became "foxhole buddies," us against the world.