When asked how he has continued to be a disciplined actor, the 53-year-old "Dangal" star said it is only his work that motivates him to be efficient.
"I am totally indisciplined. The only thing that gets me into discipline is my work. So, had I not been an actor, I would have been the most indisciplined person. That is the fact.
The actor was also asked what subject he would choose to pen a book on, if that ever happens.
Aamir said the obvious choice would be to write about his experience in Bollywood. He, however, added he has not given any serious thought to it as films keep him occupied.
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"Sometimes, even I have thought of recording my feelings so that I can use the material later. But I haven't given this a serious consideration."
At the launch, Hirani was asked if after the Sanjay Dutt biopic, he would like to bring Aamir's life on the big screen, the director said, "Right now, I am fine with making only one biopic. But who wouldn't like to make a biopic on Aamir Khan? I would love to do that in future," he said.
The actor-director duo has previously worked in "3 Idiots" and "PK".