Bachchan, who has three grandchildren -- Aaradhya, Navya Naveli and Agstya, will be seen playing a superhero in the upcoming animated TV series "Astra Force".
"When you are 73 these are the kind of people you meet... You meet kids, they are the happiest persons. We pass the age of youth, study, university, girls, marriage, wife, children... Now is the age of grandchildren," Bachchan told PTI.
"It is a lovely phase, a lot of people say the best phase of an individual's life is when he spends time with grandchildren. I will endorse that... Therefore this (playing superhero 'Astra') fitted into my mind...," he added.
"There are two children (in the show) who are twins and they are like my grandchildren. I love being in their company," he said.
Aaradhya has yet not seen the picture of his grandfather as an animated hero.
"She has not seen yet... It is too early to show her," he said.
Bachchan revealed that Aaradhya has her set of favourite cartoons, but he is not aware about them.
"I don't know (about her favourite cartoon) as she goes so rapidly on IPad watching them that it is difficult to catch up. But it (superhero 'Astra' to be played by him) will be a great incentive for her to have her lunch, dinner, breakfast, because unless she sees something on television she won't eat anything," he said.
Whenever Aaradhya sees her grandfather on the big screen, she is happy about it.
"She sees visuals sometimes. She is happy about it. I remember when I was a kid, I used to see 'Superman', 'Batman'. I feel some things you imbibe they remain with you throughout your life," the veteran actor said.