My hair grows very fast. (I take after my father and his father). I had a moustache (thin, I grant) at the age of 13, and a fairly dense beard when I was 16. I was of course asked to shave periodically by almost everybody. My argument against it is simply that it's too much of trouble, and besides, beards look nice. At least in my opinion.
At school and college, I was known by my beard - being the possessor of the largest (if not the only) specimen. It made me quite popular. So I see no reason for me to shave.
In August 1996, I started shaving twice a week. People would actually comment if I haven't shaved! I was driven to this for two reasons. One was that everyone told me that if I wanted to go to office, I had better shave. The second ...., well, let me summarize it this way: a girl who's senior to me called me "Sir". I shaved.
After that, I've been compared to the film hero Ajit innumerable times, to another hero Arvindh Swamy at least twice and once to Sharath Kumar. I don't mind it.
But that still leaves my hair and moustache. I'm fiercely proud of my moustache, and won't shave it off, ever! I may chew on it every now and then, but I've recently entered into a contract obliging me to pay Rs.25 per hair on my moustache that I chew, so I've curtailed that a bit. In fact, my dedication to my moustache won me a nomination in the IIM Bangalore yearbook.
Things got a bit worse at BCG, though. I normally like shaving every other day at best. Except that there's this character, Alpesh, at BCG, who has no better work than to walk down to my cubicle, peer over my shoulder, and comment, "How did they let you into office with that stubble?" Thanks to him, I shave every working day.
My wife suggested I grow a french beard. It tends to be a bit sparse, though. I pluck my beard when I'm thinking, or watching an interesting movie, or reading an interesting book, etc.