He has played a variety of roles in his career spanning four decades in Bollywood but megastar Amitabh Bachchan has turned the clock back by his latest avatar of a 13-year-old "witty brat" in director R Balakrishnan's upcoming film 'Paa'.

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"I think he has done a phenomenal job in playing the 13-year-old. Although intelligent and witty, he is playing a brat in the film. He is not spoiled but he is a brat," adman-turned-film director Balakrishnan said.

The 67-year-old star will be essaying the role of a child suffering from progeria, which accelerates ageing.
International make-up artist Stephan Dupuis, who did Robin Williams' make-up in 'Mrs Doubtfire', was roped in to give Bachchan the special look in the film.

With blood veins prominent on his bald head and broken teeth, the actor looks five times his age as the 13-year-old 'Auro'.