Born in Cairo in 1933 to an Egyptian father and British mother, Jehan experienced a diverse upbringing, celebrating Christmas and eating cornflakes for breakfast instead of the usual Egyptian fare of fava beans, as well as devotedly fasting each year during the Muslim festival of Ramadan. Her dislike for gender inequality stemmed from her school days when she was advised by her parents to focus on subjects such as sewing and cooking, in preparation for marriage, as opposed to the maths and sciences that could have led to a university career.