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accidental Actuaries alleged arians authentic average age average duration baby believe biologist birth Cancer Carrel cells cent disappear centen centenarians Century Century century the average Chart conservatively curve death rate decade decrease defects differential doubt Dublin duration of human dwindling eighteenth centuries England estimated eugenics evidence exceed Extension Institute external fact find found Geneva germs going group habits of living HEALTH hitherto human race hundred impassable limit improvement increases indefinitely individual hygiene induce INDUSTRIAL WORKERS infant Insurance know later LENGTHENING HUMAN limit of 100 live to 99 Louis Massachusetts Metchnikoff middle mortality natural death natural limit nineteenth century northeast oldest Oregon patients PERIODIC MEDICAL EXAMINATIONS PERSONAL HABITS physician physiological possible potentially prac preventability Professor puberty public hygiene pure quarter reached the age record represents shows no sign sixteenth statistician statistics sticking point stop supply thousand three three-quarters tion Today turning upward ultimate unreasonable vertical direction women's colleges