Wild Young Boys Tired Old Guys Metaphor.....?

Metaphor.....? - wild young boys tired old guys

Easter Sunday was a pastor of the church wearing a Rusty Cage, bent old body from the pulpit. Eyebrows were raised and in response, began to speak ... "I went into town yesterday when I saw a couple coming toward me swinging this bird cage. At the bottom of the cage were three wild birds, shivering with cold and fear. I left the boy and asked," What did you do there, my son? "Only a few old birds," said the boy. "What do you mean?" I asked.
"Take 'em home and have fun with them," he said. "I'm gonna tease 'em and pull the feathers to make' em fight. I have a really good time." "But you're tired of those birds sooner or later. What do you do?" "Oh, I had some cats," the boy said. "They like birds.'ll Take 'em to them." The pastor was silent for a moment. "How much for these birds, the son wants?" "Huh Why you do not want the birds, myter. They are simply the old field birds. They do not sing. They are not even enough! "How much?" The priest she asked again. The size of the shepherd boy, as if he was crazy and "$ 10? Shepherd's hand in his pocket and pulled a ten dollar bill. Has been placed in the hands of children. At a moment when he was gone.
What is the metaphor.