Hey iam 22 too and from mumbai
and yeah ive got some white hair as well
dint really care though
asked a hair doctor few years back
all he could tell me is that all this pollution
the water is what causes white hair in young people.
About remedies other than plucking them out :p
the hair dyes come handy and coloring your hair is a new "fad" these days so that too helps covering the whities.