It’s hard to reach [the age of] 100. We’re not programmed for longevity. We are programmed for something called procreative success.

Source: "How to Live to Be 100+." TEDxTC. Sep. 2009. Conference Presentation. Additional Information: This quote is from National Geographic writer and explorer Dan Buettner's 2009 TED Talk on how to live to be 100. The quote means that humans are not designed to live to the age of 100; rather, evolution has designed our bodies so that we generally live to be old enough to reproduce (have children) and for our children to reproduce. Following this quote, Buettner goes on to explain that nevertheless, there are things we can do to extend our lives. Watch the full TED Talk here: Dan Buettner - How to Live to Be 100+

“How to Live to Be 100+.” TEDxTC. Sep. 2009. Conference Presentation.