The combined human population

Quantifying all of humanity requires a firm starting date for when humans became human. For this exercise, the two demographers chose 190,000 BCE as the cutoff.

The demographers estimate that 109 billion people have lived and died over the course of 192,000 years. So adding the people alive today, we get 117 billion people that have ever lived. That means that for every person alive today, there are about 14 people who are not.