Amitabh Bachchan, who is 83 years old, still gives tough competition to not only Khans but also to the young actors. The Shehenshah of Bollywood never misses any chance to impress his fans with his hard work and dedication towards his profession. He is right now gearing up for the grand launch of Kaun Banega Crorepati 18, which is starting on August 10. Big B recently shared on his blog that he did a 24-hour shift for the show and explained why it is necessary for him to work hard at the age of 83.
