The change in weather has left veteran actor Dilip Kumar with mild fever -- and under house arrest as per doctor's orders. I have been having mild fever since a couple of days thanks to the change in the weather. My doctors are not ready to let me go out lest my fever rises he tweeted Monday. The actor will turn 90 on Dec 11 but he is not planning any big bash to celebrate the special day. The decision came following the recent death of two of his close friends producer Yash Chopra and Shiv Sena chief Bal Thackeray.