"With time you have to change. You don't have the same temperament that you had when you were in school or college. And I guess the roles that come your way are also like this.
"That is not to say that it is lost. If there is anger to be depicted in a film, I can still do it. It depends on characterisation, what the director or the story demands from you," Bachchan told PTI in an interview.
The 71-year-old has had a varied and impressive career in films, playing roles of a father seeking justice for son in 'Viruddh', teacher of a blind-deaf-mute girl in 'Black', a self-obsessed chef in 'Cheeni Kum', a man in love with a much younger girl in 'Nishabd' or a child suffering from progeria in 'Paa'.
Bachchan feels fortunate to be considered more than just a serviceable senior character actor and be given the opportunity to experiment.
"I think as you age you can't be playing the romantic hero. There obviously are more character-driven roles. When you are reaching 72 you automatically go to certain regions in terms of characters in films. But I am just very fortunate that all kinds of roles are coming my way," he said.
With a career spanning more than four decades and having starred in over 180 films, the National award-winning actor says even now he does not feel burdened with work and gets up every morning, all rejuvenated and excited to go on to the sets.