When in the Course of human events, it becomes necessary for one people to dissolve the political bands which have connected them with another, and to assume among the powers of the earth, the separate and equal station to which the Laws of Nature and of Nature's God entitle them, a decent respect to the opinions of mankind requires that they should declare the causes which impel them to the separation.
Some researchers believe that there's a limit on how many years a human being could live, the maximum being 125. Others see a world in which we have centenarians walking around with people who have lived for 500 or 1,000 years. Diseases related to aging, like dementia and heart disease, currently block us from reaching that point. Our body parts wear out from use.
They didn't. Most people died in their first 2-3 years. One should also note that the biological capacity for life expectancy today is the same as ancient humans: 120 years. That's about the limit of the homo sapiens. That means that there were always people living over 100 years, in ancient, medieval and modern times in every region of the world.