Jahanbani was born on 16 April 1928 into a family with a long military history. His father, Amanullah Jahanbani, was a lieutenant general, who served in the Persian Cossack Brigade with Reza Shah Pahlavi.
Jahanbani was born into a family with an established military tradition. His father, Amanullah Jahanbani, held the rank of lieutenant general and served in the Persian Cossack Brigade during the reign of Reza Shah Pahlavi.