This document discusses the challenges facing pension systems in Europe and Central Asia due to demographic changes. It provides historical context on the development of pension systems over the last century which established old age security for workers. However, increasing life expectancies, declining birth rates, and aging populations now threaten the long-term sustainability of these systems. The document examines reforms countries have undertaken to pension eligibility, benefits, and financing to adapt to these new demographic realities. However, it finds that more fundamental reforms will likely be needed to maintain fiscal balance in pension systems in the coming decades.