Megastar Amitabh Bachchan marked 25 years of 'Kaun Banega Crorepati' and 23 years as its host, addressing feedback on his 'changed look' and assuring he’s doing his best for his age. Sharing heartfelt memories of his late mother Teji Bachchan, the cine-icon credited audience love as the driving force behind his long-running 'KBC' journey.