Four and a half

A man and a kid came by today to have a look at Bendik's bed, since he's selling it.

As soon as they walk in, the kid looks at Bendik.
"Do you know how old I am?"
"No...how old are you?"
"...four and a half"

Bendik leads the man to his room to show him the bed, the kid stays behind hesitating for a moment. He looks up at me.
"Do you have kids?"
"Uh?...No, i don't"
"How come you don't have kids?"
"Well..I'm too young....I think."
"Too young?"
"Yeah, too young..."
"How old are you?"
"I'm twenty-two"
"How come you're twenty-two?"
"That's because I was born twenty-two years ago...Yes."
"Oh...I am almost eight."
"Really?"
"How old will you be when I'm eight?"
"Mmh...that's in three years...Guess I'll be twenty-five"
"That's when you'll die."
"Oh...?"
"And you know what happens when you're a hundred?"
"No, what happens?"
"You'll get a letter.
"And what's in the letter?"
"It's a letter from...the king."
"But how can I get a letter from the king when I'm a hundred if I die when I'm twenty-five?"
"Well...than you won't get a letter from the king."