Paa is a 2009 Indian film directed by R. Balakrishnan (credited onscreen as R. Balki) starring Amitabh Bachchan, Abhishek Bachchan, and Vidya Balan.The film is based on a rare genetic condition known as progeria and places emphasis on a father-son relationship. Amitabh Bachchan and Abhishek Bachchan, in real life, are father and son respectively, but in Paa, they played opposite roles. The film was released worldwide on 4 Dec 2009. Veteran composer Ilaiyaraaja scored the music. The film was critically acclaimed and a success at the box office, for which Amitabh Bachchan received his third National Film Award for Best Actor and his fifth Filmfare Best Actor Award and Vidya Balan got her first Filmfare Best Actress Award. Paa deals with a real medical condition that results in accelerated aging.