Of course it's cartoonish, so there's no clarity of age. But judging by their sizes in the drawings, and certainly by the voices in the singing, they're all quite young. To me, it's as if it's for the youngest of kids to say, "hey, they're my age!"
And I think it's pretty creepy that the "stumble" and "fall" that Jehovah "raises" these sinners from is knock down some oranges at a fruit stand. Really? These are such little kids that they have no concept of what lies ahead in the adult world, and the judicial committees they could be facing in the future. That's then followed by how no matter who else lets them down, their imaginary friend Jehovah is always there for them. In reality, WT and my imaginary sky-daddy have been the greatest to "fail me and proved to be untrue." Daydreaming about animals in paradise gets pretty old when you're wondering how you're going to pay the bills piling up around you.