It might if the reasons we were dying between 55-75 were related to poor nutrition and low activity levels. My assumption (always dangerous) is that the things

It might if the reasons we were dying between 55-75 were related to poor nutrition and low activity levels. My assumption (always dangerous) is that the things that kill us in those age ranges are diabetes, heart disease and stroke which are all manageable in some fashion through moderation in diet as well as exercise. Once you make it past 75, you've probably been either lucky genetically or you've been living well or some combination of the two.