Hi i am from south india.if any of my parents or grandparents lived up to age of 105, and if i keep healthy, can i strike a century?

Definitely maybe: Good genes are important but diet ; lifestyle are even more important. Someone with good genes who drinks a lot, smokes, has an unhealthy diet ; lots of stress will probably have worse health than someone with average genes who takes good care of themselves. But having good genes ; following a healthy diet ; lifestyle gives one the best odds of longevity.

You have: A better chance then most if you maintain healthy diet , exercise, ; live the good life with no excesses.