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I was curious about you question so quick did a quick spreadsheet and chart, blue: number of grandparents, red: world population.
Assuming a generation every 20 years then your number of great gr.... great grandparents will match the world population around 1450. Now obviously that doesn't mean you are a direct descendant of everyone who was living on the world at that point in time as you will start to get overlapping grandparents within a few generations back |
https://youtu.be/Fm0hOex4psA