As the utilization of satellite technology continues to permeate various sectors, the need to efficiently manage this orbital infrastructure has never been more pressing. Satellite Lifecycle Extension Services (SLES) offer a pathway to extending the operational lives of satellites, thereby deferring the significant costs and resource investments associated with manufacturing and launching replacements. This article reviews SLES, detailing what these services entail, assessing which satellites stand to benefit considering factors such as purpose, mass, and orbit.