Fifteen

Susan and the husband made it across the finish line to their fifteenth wedding anniversary. What stamina!

What is their secret?
Be nice, tell the truth, apologize as soon as you figure out you're wrong. This is all pretty obvious. Susan has also established some bad behavior standards that she will not sink beneath, such as calling him names or embarrassing him. This has nothing to do with yelling & screaming at him like a crazy shrew, because making him mad is ok.

Susan has figured out how to keep her low libido from eradicating the romance in her marriage by limiting the amount of I'm too tireds in a given period.
Sometimes Susan even does things that she never did before, like make the bed every morning, just because she knows the husband likes it.

Susan doesn't keep quiet, she sez whatever she needs to say and she won't back off from a fight, but this only extends to the husband, with anyone else she backs off.

After so many years manacled together Susan is still interested in hearing his opinion on a range of topics. She might also request that he refrain from offering his opinion because she's trying to read the paper or listen to the TV or she just can't stand to hear him say one more word.

Fifteen years and Susan's not tired of her man yet,
but there's always next year.