A co-worker is celebrating her birthday today. She always gives me a hard time about being older than her -- even if it's only 8 months. The "old" jokes sometimes get us through a tough moment at work, so I don't mind. Of course I had to give her a hard time, since she is now as old as me!
The inside of the card says (I think -- I don't have the card here with me), "And think about the fact that you're now as old as me!"