Youth

Youth is happy because it has the capacity to see beauty. Anyone who keeps the ability to see beauty never grows old. 

~ Franz Kafka

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Sometime you are going to know someone who giggles when they fart even if they are a grown adult. When you challenge them, you might hear them say that they are maintaining the exuberance of youth. When they say this, I recommend that you reply, "I encourage you to maintain that exuberance, just not the flatulence."

Of course this could be where the concept of an "old fart" comes from...