Answer:
I have Eighty-eight keys but cannot open a single door.
When young, I am sweet in the sun. When middle-aged, I make you gay. When old, I am valued more than ever. What am I?
I am full of holes but still holds water.
My first half means container. Not a lot of people understand my language. What am I?
I am the kind of soda you must not drink.
Give it food and it will live, give it water and it will die.