PM Modi today took to his Twitter account to extend his best wishes to the "Pink" star.
"Happy birthday @SrBachchan! India is proud of his cinematic brilliance & support to many social causes. I pray for his long & healthy life," wrote the prime minister.
Bachchan has been engaged in spreading awareness on causes such as polio, tuberculosis and cleanliness among others.
The star had said he has decided not to celebrate his milestone birthday and will not be present in Mumbai.