"In this industry as you grow older you do not have many choices... You just take what comes your way... Which is not very often. I guess there is always a senior citizen to be enacted in young filmmakers' scripts, and so they ask," 71-year-old Bachchan told PTI in an email interview.
Bachchan would be next seen in horror comedy drama 'Bhoothnath Returns', a sequel to the 2008 film of the same name. The actor would reprise his role of a friendly ghost.
The 'Sholay' star was often seen riding an automatic scooter with the kids. He also shot a party song with rapper Honey Singh.
"That scooter or cycle has been with me for years and has been used often enough... Even on sets," said Bachchan.
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The actor says his grandchildren are excited about his upcoming project.
'Bhoothnath Returns' will hit the screens on April 11 during the Lok Sabha elections but Bachchan is unperturbed by what will happen at the box-office.