It's been said that the bonds of love grow stronger with time, which is why your parents are still freaking that you married that rando you met while traveling in Thailand. Turns out you may know your paramour as well as your parents know one another -- or even better.

A new study suggests that couples who were together for an average of 40 years knew less about each other than newlyweds, who have been together only a year or two.

Researchers speculate the reason for the discrepancy is that those at the start of a relationship have more to gain from really trying to get to know their partner (yes, and it's called sex), while older couples, despite many years together, already feel they know everything about the other person. (Surely the younger couples are at an advantage since one hour on Facebook can yield more information than years of actual talking?)

Interestingly, the subject the older couples knew the least about was the food preferences of their spouses. And since they were more likely (than the younger couples) to tell a little white lie now and again, we've finally solved the mystery of why mom's "special" meatloaf keeps reappearing.