"The hour has passed and the greetings have poured in and the family has been with me and that is the greatest gift, if gifts were to be any judge of affection...," Bachchan wrote on his blog.
A contemplative star remembered some of his earlier birthdays that were spent in loneliness.
"There have been endless occasions when the day of 11, has been spent in solitude thinking and assessment... They were days of loneliness and of pressure... But when you look back at them you wonder why those days were chosen to be of any pressure orientation," he wrote.
Bachchan seemed wistful as recalled his earlier days, saying, "There is a numbness in all that we do now... As opposed to the gaiety and laughter and excitement of the earlier years... I have always wondered why... But it there and it shall remain I presume for the days left in my life.. Its been a long day (sic)."
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The megastar later took to his Twitter to thank his millions of fans for their wishes, saying he felt blessed to receive so much love.
His actor son Abhishek shared two pictures of himself with the senior Bachchan, mother Jaya, wife actress Aishwarya and sister Shweta Nanda.
Born to Hindi poet Harivansh Rai Bachchan and Teji Bachchan in Allahabad on October 11, 1942, Bachchan is the only actor of his generation to have an active and busy career even today notwithstanding his age and popularity of current generation's stars.