Answer:
I am in the past, never in the future. I don't exist, but have existed. I saw what you saw, and this is what I will ever see. What am I?
I have keys but no locks. I have space but no room. You can enter but can't go outside. What am I?
If I have it I don't share it. If I share it I don't have it. What is it?
Everyone asks for me but yet everyone hates to face me. For someone I am agony, for others I am relief! What am I?
Born of sorrow, grow with age, you need a lot of me to be a sage. What am I?
I will disappear every time you say my name.