How tall will Kaylea be?

I'm taking bets now on how tall you think Kaylea will be when she is 18 years old. My guess is 6'0". Look at the picture above (you can click on it to make it big) and see how tall she is standing next to the other kids in her class. Her class is the group of kids on the very first row. She is almost a full head taller than everyone in her class (and keep in mind she is one of the youngest in her class... many of them are already 3 years old. Crazy!