My wife and I got married in 1968, and in the 50-plus years we've been together, we've never had a single fight about money. There were deliberations, but never any fights. I get asked all the time: "How do you do it?" The secret, I tell them, can be summed up in three words: It's our money.

I realize this isn't the case for most couples. But having spent my entire career in employee benefits, finance and retirement counseling, I've witnessed a handful of misguided ideas about marriage and money.