If my ability to divide is still present, then almost nineteen million people will have their birthday today. Which is around four and a half Kentucky's or around six Wales's. It would be somewhere near the population of New York State, or well over half the population of Uganda. But not quite the population of Beijing.
There was a time the population of human beings was such that around thirty people would be having a birthday today. I think I can fairly say that I know thirty people by name. But it would be very worrying indeed to know the names of nineteen million people.