260 children are being born every minute on this planet. There are only 60 seconds in a minute, which means that multiple children are necessarily being born at the same time.
But at what precise point does birth actually take place? After the water breaks? During labor? When the first limb emerges?
Or does the process begin at conception, during embryonic development? Is it when the embryo first develops recognizable organs? When the structures that eventually become the lungs begin to form?
There is no single, objectively identifiable “youngest person on Earth.” There is simply a continuous process of human development, with no meaningful point at which one individual suddenly becomes more or less human than they were a moment before.
And perhaps there is no meaningful “oldest person” either. There is simply a continuous human lifespan, measured from one arbitrary point to another.