premise: Nawaz Sharif is an old prime minister.
hypothesis: Mian Muhammad Nawaz Sharif , is a Pakistani politician who is the 20th and current Prime Minister of Pakistan , in office since June 2013 . He has previously also served as the Prime Minister from 1990 to 1993 and from 1997 to 1999 . Born on 25 December 1949 into Sharif family in Lahore , he is the son of Ittefaq and Sharif Group founder Muhammad Sharif , and the elder-brother of three-time elected Punjab Chief Minister , Shehbaz . In 1990 , Sharif led a conservative alliance to victory , leading him to become the Prime Minister . As a result , Sharif was elected Prime Minister by Parliament .