Some voice in hospital or hovel will utter blessing or curse, and our mother earth, this island universe, will issue its 6 billionth living soul. Some say it's happened already. After all, people-counting is not an exact science. We have no universal census taker in this hive of humanity, where populations refuse to hold steady. Wars, plagues and natural disasters render untidy the task of predicting departures, so there's no way to calculate precisely when live births overtake deaths sufficiently to produce this mythic number 6 billion.
Experts suggest one in seven people ever born are alive today.
Take what comfort you can, but I don't think that means you stand a one in seven chance of never dying. Actually, the ratio may be as low as one in 20. Still, the population of each nation is known to an astonishing degree, so that most experts believe the 6 billionth living person has checked in. Because more boys are born into the world than girls men compensate by dying younger the six billionth soul is likely a male. He's also likely to be Asian or African and quite poor, although I'm sure some entrepreneur would gladly lavish riches upon him.