This article is just a math lesson on exponential decay using human mortality trends as an example. The author states the following in the article: Exponentia

This article is just a math lesson on exponential decay using human mortality trends as an example. The author states the following in the article: Exponential decay is sharp, but an exponential within an exponential is so sharp that I can say with 99.999999% certainty that no human will ever live to the age of 130. (Ignoring, of course, the upward shift in the lifetime distribution that will result from future medical advances)