By Jon C. White, MD
I read a statistic the other day that I thought must surely be a misprint. It claimed that two-thirds (approximately 65%) of all people who have ever lived to the age of 65 are alive today. I did some research with the intent of exposing the obvious exaggeration, but instead came up with more disturbing statistics: The number of people who have ever lived on the earth since man first appeared 50,000 years ago can be estimated by mathematical modeling; the total is thought to