This study analyses reforms measures in the United Kingdom, Germany, France and the United States, considering the triggers and factors at work in the policy-making process and seeks to identify patterns and trends. In all four countries, despite differences in pension structure, similar measures have been taken to encourage or impose a delay in the take-up of state pensions. The study explores the similarities and differences between these in order to establish whether the rationale for raising the entitlement age was the same in each case, whether the reforms had the same aim and whether they addressed the same problem.