Good Riddles

Question: what is a bud inside the house and flower outside the house

Question: There is a one story house. The walls are blue, the floor is pink, the stove and cupboards are red. What color are the stairs?

Question: No matter how terrible things get for the people of the Arctic, they will not eat a penguin.

Why not?

Question: I am a nice word composed of five letters, but the Romans would call me a numbers.

What am I?

Question: When I was 2 years old, my brother was half my age. Now I am 100 years old, how old is my brother?