Answer:
What's always coming, but never arrives?
What is something that can go up quite easily, but is not as easy to bring back down?
What do people spend a lot of money on every year but never want to use it?
What age most travelers have?
Where humans breathe liquid.
What goes up the hill and down the hill, And spite of all, yet stand still?
Easy
Animal
Difficult
Food
Funny
Kids
Logic
What am I?