Barney

On the kids show Barney they change kids like underwear. A delightful little kid hits a certain age and their gone.

Maybe Barney should sing a special little song when they leave the show.

Your not special your not the only one there’s a million buggers like you.
You got no skills you’re a social ill and nobody really likes you.

You’re not special You’re not special.
How can I put this to you?
You’re not special You’re not special.
A boil is better then you. A boil is better then you.

The only other explanation for the kids leaving at a certain age is Barney is not a strict vegetarian.