Answer:
Brown I am and much admired; many horses have I tried; tire a horse and worry a man; tell me this riddle if you can.
I am a bow that can never be tied or broken but can disappear. What am I?
A young man wants to have me but when he has me, he no longer wants me. What am I?
The faster you run, the harder it is to catch me. What am I?
Born of sorrow, grows with age, you need a lot to be a sage. What is it?
I am your mother's brother's only brother in law. Who am I?