This is an important point you've raised. In particular, lowered infant mortality combined with a poor grasp of statistics makes it look like you and I are liv

This is an important point you've raised. In particular, lowered infant mortality combined with a poor grasp of statistics makes it look like you and I are living longer, even when those infants that might have died before could end up keeling over at 30 from health problems and we might die a few years earlier than we were likely to a few decades ago. Also, people who are living longer as a result of advances in life-saving surgery are doing so in poor health as a result of the reasons for the increased necessity of these surgeries such as coronary heart disease and type 2 diabetes. Increasing the retirement age in this context could mean attempting to employ a bunch of people not fit to be productive, in a worst case scenario.