Oh well, if you want, I can tell you what happens unless you already know.
You're 13! I'm nearly 13! Then you'll be 14, then I will. Then you'll be 15, then I will. Then you'll be 16, then I will. Then you'll be 17, then I will. Then you'll be 18, then I will. Then you'll be 19, then I will. Then you'll be 20, then I will. Then you'll be 21, then I will.
When can we make that trade?