I wish that i had a pencil thin mustache, but i don't know how to get one.  Do you have any knowledge you can share with me on this subject?
I don't know much about mustaches. I'm a girl, and my boyfriend doesn't have a mustache.
I am pretty sure that a pencil mustache is a type of facial hair that is found just above the upper lip, most of the time on men. 
Yes, I know where a mustache is located. I would think to get the pencil thin look, you would just need to trim it frequently.
Here in India, the sikh military men are only allowed to wear whiskers and mustaches of moderate length. 
Oh really? That is interesting. I had no idea. So they can't have beards either?
No.  for example, during the battle of Saragarhi between Britian and Pashtun tribesmen in 1897, I am sure that none of the Indians had beards, only whiskers and moustaches.