Answer:
I've been around for millions of years, but I am no more than a month old. What am I?
I'm written with two letters, said with one and seen with two. What am I?
What is full of holes but still holds water?
I can be swallowed But I can also swallow you.
I'm a precious stone in a pack of cards. What am I?
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.