... one thing you should always check very early on - pretty much on the first date - is that they don't have a birthday that falls in January or early February. If they do, you can date them, but you shouldn't move in with them or marry them. Because, if you do, the day will eventually come when their birthday party falls on the same day as a playoff game or the Super Bowl.
All of this, of course, is just a nice way to say that my lovely wife, Georg, (who reads and comments here often enough) is celebrating her birthday today. It's one of those "big ones" that ends in a zero, but since I've learned enough by now not to get more specific, I'll just guess that it's twenty.