My parents have been married for 45 years. They met, dated a few months and then my father got drafted, they wrote back and forth when they could and after he got home he asked her to marry him. She was 20 and he was 21 when they got married. They have their issues sometimes but love each other dearly and are very happily married. My mother had cancer last year and had to sleep in a recliner for 4 months after because she couldn't sleep in a bed, my father slept on the couch every single night next to her in case she needed anything. She never did but he insisted on being near her. He also went to radiation with her every single day for 6 weeks.
I have been with my husband for 18 years, we met when I was 14 turning 15, he asked me out 7 days after I turned 15 and we are very happily married. He is the only guy I ever dated. He dated a girl before me for like a month, very casually, so I was his first serious gf.