Yesterday was my parents' 66th anniversary. Their marriage has seen 12 presidents come and go. It's witnessed the rise and fall of the Berlin Wall, and the hula hoop. It's endured six kids, and delighted in 7 grand kids and thrilled with 7 great grand kids.
I don't know if they have a secret beyond being crazy about each other, but in a nation where, according to the American Psychological Association 40-50% of all marriages end in divorce (including unfortunately those of 4 of their sons), their relationship stands out.
In all the changes that their marriage has endured over the past 2/3 of a century, one aspect has remained constant. There's this certain look they give each other. I've seen it used to stop disagreements. I've seen it during happy times. It's a silent communication just between them.
And it's that look that has kept them going for 66 years.