How Old Is Mr. Tortoise?

From the author of I Don't Want to Be a Frog comes a hilarious new picture book that asks readers to solve one very important mystery
It's Mr. Tortoise's birthday, and he can't wait to eat cake with his friends. But there's a hitch! Mr. Tortoise can't remember how old he is, so his friends don't know how many candles to put on the cake. And they won't stop (or slice) until they figure out the mystery.

Could Mr. Tortoise be as many years old as there are sections on his shell? He's twice as ...