Answer:
Born of sorrow, grow with age, you need a lot of me to be a sage. What am I?
I am carried by mad animals.
While you were folding a letter you got me. Usually you will do whatever it takes to avoid me but now you can't help but find me.
What goes up but never comes down?
I am an instrument capable of making numerous sound but cannot be touched or seen.
A little house full of meat, no door to go in and eat.