Answer:
You will always find me in the past. I can be created in the present, but the future can never taint me. What am I?
In my life I must bare my bloodline I must share.
I am a cave full of bones and the house of a worm.
I can be thin but not fat; in your body but never on your placemat. I'm always better when I'm fresh but you'll never see me in the flesh.
I have more shoes than anybody but less feet than everyone. I am met in the morning but departed in the night. I may shake as if I'm angry but I won't bite.
When is it bad luck to see a black cat?