Aishwarya Rai Bachchan has dismissed scepticism about her pairing with superstar Rajnikanth, two decades her senior, saying that he like father-in-law Amitabh Bachchan is an actor who has defied age. "Rajni sir, like Pa (Amitabh) is a professional and humility personified. There was no age factor. Theyare both legendary actors due to their body of work. Hence, their cinema becomes exciting to the viewers. Rajni sir's humility is a lesson to learn," Aishwarya said. The 60-year-old Tamil cinema legend had thanked the former Miss World for working with him at the music launch of the film last month and Aishwarya said that the film was a difficult but fun ride. The 36-year-old actress said, "Director Shankar and myself were attempting to do a project for quite a while now. The opportunity came with 'Robot'. This is not an easy film to make and is technically way ahead." The actress plays a young student Sanaa in the film and described her character as a live...