If you don't expect too much from me you might not be let down
"Well," said the boy, "in my family, everyone is born in the air, with his head at exactly the height it's going to be when he's an adult, and then we all grow toward the ground. When we're fully grown up or, as you can see, grown down, our feet finally touch. Of course, there are a few of us whose feet never reach the ground no matter how old we get, but I suppose it's the same in every family... You certainly must be very old to have reached ground already." "Oh no," said Milo seriously. "In my family we all start on the ground and grow up, and we never know how far until we actually get there."
"What a silly system." The boy laughed. "Then your head keeps changing its height and you always see things in a different way? Why, when you're fifteen things won't look at all the way they did when you were ten, and at twenty everything will change again."
"I suppose so," replied Milo, for he had never really thought about the matter.
~The Phantom Tollbooth by Norman Juster