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By common consent, human life has been limited to three score years and ten since the time of King Solomon, with a small minority surpassing that limit and a few who have lived a hundred years or more; and with conditions of life unchanged the period would doubtless remain the same. The conditions of life, however, have already changed. The influence of hygiene and measures of sanitation practiced since the beginning of the last half century, together with the wonderful discoveries and inventions employed for the comfort and protection of mankind generally, have unquestionably raised the lifetime of a generation several years. Moreover, this rising average must continue while popular education of the masses is becoming a uniyersal policy, and the laws of health laid open to the people by the secular press everywhere; and now even the octogenarian may hope to spin out a few more years.
DALTON RH. THE LIMIT OF HUMAN LIFE, AND HOW TO LIVE LONG. JAMA. 1893;XX(22):599–601. doi:10.1001/jama.1893.02420490003001a
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