Christianity Today's article Live Longer, Healthier, & Better The untold benefits of becoming a Christian in the ancient world explains why it was that many early Christians lived longer than their contemporaries. Since Christians treated others as if they were brothers, they tended the sick even when they weren't related. In the case of plagues, some people survived simply by being given food and water, which the nursing Christians did at risk to themselves. Pagan girls might be married before puberty, but Christians married somewhat later. This drew women to the early Church and would have resulted in fewer early pregnancies. Infanticide and abortions were outlawed in the Christian community. While infanticide would not have affected the age at death because the unnamed infants would not have been counted in the census, abortion and pregnancy would have.
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