"Warmest birthday greetings to our guide & inspiration, the respected Shri LK Advani ji. I wish Advani ji a long life filled with best health.
"Advani ji's contribution to the country is invaluable. He has always been respected as a person of immense knowledge & integrity," Modi tweeted while hailing the former deputy prime minister.
"Personally, I have learnt so much from Advani ji. For Karyakartas like us, he is the best teacher & the epitome of selfless service," the Prime Minister said in another tweet.