Best medium riddles for teens

Dean Sam and Castiel are three brothers. Interestingly their current age is prime. What's more interesting that difference between their ages is also prime. How old are they?

What do moths study in school?

This is as light as a feather, yet no man can hold it for long. What am I?

Hockey Stick and ball cost $50. If the Stick cost $49 more than the ball. What is the cost of each ?

What has two hands and face but no arms and legs?

I follow you all day long, But when the night or rain comes, I am all gone.

I’m the end of the colourful rainbow. What am I?

In a jungle where there is no streets lights or any other artificial source of lights, I notice a black snake crossing the road. How did I get sight of snake ?

What kind of animal lives longest in zoos?

I don't have wings, but I can fly. I don't have eyes, but I will cry! What am I?