Kovind was born in 1945 in Kanpur.
"Birthday wishes to Rashtrapati ji. May Almighty bless him with a long and healthy life devoted to the service of our nation," the prime minister tweeted.
Modi said since his tenure began in July, the president had endeared himself to the people of India through his simple and compassionate nature.
"I have always found Rashtrapati ji to be sensitive towards the aspirations of 125 crore Indians, especially the poor and marginalised," he added.
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