riddles 28 april

I greet every guest, but never say a word

I go up and down but I never move

You might say I'm popular - I always have the most dates

I'm full of holes but can still hold water

I begin and end with the letter "e", and usually only contain one letter

I have a spine but no bones

I'm tall when I'm young and short when I'm old

I have a neck but no head, yet can still wear a cap

I'm made of water but will die if you put me in water

There's a one-story house in which everything is yellow.

Yellow walls, yellow doors, yellow furniture.

What color are the stairs?