Millions of people across 20 states and union territories will cast their votes in 91 constituencies in the India elections.

One of them is 102-year-old Shyam Saran Negi who lives in Kalpa, deep in the Himalayas bordering China.

He has been voting since the first election in the country in 1951.

Produced by Sanjay Ganguly, Rajini Vaidyanathan and Peter Emmerson