system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How can the Sentinelese people, who number ~250, and been living on the same island uncontacted for 60000 years, not number higher in population or be inbred to the point of severe consequence

Looking at the exponential growth that the human population has showed, would we not expect more than ~250 people to be living where there has been undisturbed existence for more than 60000 years?

Also, would they not be so imbred that there would be severe genetic deficiencies?
gpt
* We don't actually know how long the Sentinelese have been on their island, only that it's more than 300 years.  We know anatomically modern humans reached the *general area* about 60,000 years ago, but that doesn't tell us when they reached that particular island.
* We don't know that they've been undisturbed the whole time they've been on the island.  If one group of people managed to find it, a few others could easily have, particularly if we're talking about 60,000 years.  For all we know there could have been a new group of people arriving every 500 years to add to the gene pool.
* If the island can't produce enough food for more than ~250 people, then there can't be more than ~250 people living there at any time.  So a lot of them just die at an early age.