According to this website, of all the people living on Earth, I was the 4,611,347,584th person to be born. Can you figure out how old I am???
There are lots of other interesting mathematical things about this. First, just the fact that the population of the Earth increased by about 2.5 billion people in my lifetime--more than half of what it was when I was born--is just staggering. I know that large numbers are hard for kids to conceptualize (adults too! me (non-kid, non-adult) too!), but there's something in here that makes you say WOAH. Even if you put in a kid's birthday (I picked a random 15 year old), there were still about 1 billion people born in their lifetime.
Of course there's also interesting stuff with exponential growth, how we would calculate this number, and so on. I'm also interested in the statistic of how many people have been born on Earth since the beginning of time. This website gives an interesting summary of that calculation, including this video:
The World Bank has a shorter video on the same topic:
I like the stat in this video that 7% of all the people who have ever lived are alive today. Holy smokes!
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