I saw the weirdest interracial couple today, what do guys think of them?

I saw this interracial couple at the supermarket. The chick was black/mixed and the dude was white (super rare, i know, but what was really weird was that they had a huge age difference. she looked 18-20 and he looked 50-something) .. At first, I was like "yuck! she's dating a grandpa" but I was eavesdropping on their conversation and then they kind of grew on me lol...... they seemed really happy together. I liked their nicknames for each other.. She called him "blondie" and he called her "brownie". Which i thought was pretty cute.