So, the doubling in life expectancy in the last hundred years doesn't have anything to do with the deseases like diabetes, dementia, heart desease, etc.? They all appear at advanced age, and 100 years ago people would die of infections, or accidents, etc., before they could develop the old age diseases.

Thanks to vaccinations and much better sanitary, medical, nutritional, etc. conditions, we now live much longer and therefore develop all the old age diseases.