Megastar Amitabh Bachchan says he is not "qualified" to pen an autobiography even though he has an illustrious career of over four decades in Indian cinema.

At an open question-and-answer session at the Penguin Annual Lecture 2013 in the capital Friday night, Big B was asked if he has given a thought to sharing some of his life's experiences via a book.

"I am not qualified to do that," said the 71-year-old thespian who continues to entertain the people through his films and popular TV show "Kaun Banega Crorepati".

But isn't it what several "legends" have done - penned autobiographies to share their life with the world, asked host Rajdeep Sardesai.

"I have never considered myself a legend," said the humble actor, adding that he "didn't even know what happened in the past seven minutes" and so, recounting over 70 years of ups and downs in his life would be quite a task.