Kids Riddles

Question: Which is correct, 9 and 5 is 13 or 9 plus 5 is 13?

Question: I was the first and now I am the one.

What am I?

Question: Skinny I am fast,
fat I am slow,
but I'll still delight you from your eyes to your nose.

What am I?

Question: You're in a room with no doors or windows. Just a mirror and a table.

How do you get out?

Question: what can walk on 4 when they are born, walk on 2 legs when they are older and walk on 3 when they are old uncles and aunties?