I don’t see any need to know these things:
If the US Federal debt of $8 trillion or so were paid in dollar bills the height of the pile would reach to the moon four times. One million, five hundred and twenty four thousand kilometres.
The number of modern Homo Sapiens believed ever to have lived: about 15 times the current world population: one hundred seven billion people. Almost all of them now blowing in the wind (7,452,000,000 tonnes of dust and water).
The country with the oldest median age? Not Japan but Monaco (about 46 years). The median of medians is 28 years, but skewness is common when you’re tiny.