This document summarizes a thesis consisting of four papers that use microsimulations to analyze the effects of aging-related policy measures in the Netherlands. The thesis examines the Dutch pension system, uses micro data on pension payments and entitlements, and models retirement decisions to analyze the impacts of policy alternatives like abolishing partner allowances, raising the retirement age, and individualizing state pensions. The microsimulation model links demographic trends to retirement behavior and is useful for evaluating policy options to address the rising costs of aging on public finances.