Lahore: PML-N chief and former prime minister Nawaz Sharif is celebrating his 68th birthday today.  According to party sources, Nawaz Sharif will celebrate the day with simplicity along with family members at his Jati Umra residence, though party workers have planned cake cutting ceremonies separately to mark the day.  The ex-prime minister will also visit the graves of his father and younger brother to pay his respects on his birthday. –Staff Reporter