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Our mean life span has changed dramatically, but the maximum life span has not.
- In 1800, the mean life span in the United States was about a quarter century and the maximum was about 120.
- In 1900 the mean was about 50 years and the maximum had not changed.
- Today, the mean is about 75 years and the maximum still has not changed.*
Although our life expectancy has increased in recent years, we still have a long way to go before our mean life span is that of Moses.
We start aging at approximately age 25. Aging is a gradual process - it seems slow but often when we realize how old we are, it seems like it has happened quickly.
Back to the Future- we do not yet have the technology to bring us back to our chronological twenties. However, we do have the ability to reach a higher chronological age, and at the same time function at a younger age.
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