Reliability analysis of complex multiple repairable systems (MRS) such as aero engines. rolling stocks and nuclear power plants has always been an area of interest for the research fraternity. An appropriate age based overhaul maintenance policy for such systems can provide impetus to the operations. The paper proposes two different age based maintenance policies; Policy-I and Policy-II. https://www.roneverhart.com/Liftmaster-CSL24UL-Slide-Gate-Opener/