At 75, veteran actor Amitabh Bachchan is certainly fit for his age. However, the actor is currently nursing an old injury that got recently aggravated while shooting. "An old injury to the left shoulder has through time, activity, and age, been giving me nagging pain. It recently got aggravated due to some strong usage on set. Though the pain became unbearable, the medication and the tunnel visit has shown that it is an extra tear on the rotator cup, but that it has not reached an alarming stage," Big B shared in his blog.