Just to be clear, citing Wikipedia's table (which appears to be your source), in the Paleolithic that's an additional 39 years after reaching age 15. Or in othe

Just to be clear, citing Wikipedia's table (which appears to be your source), in the Paleolithic that's an additional 39 years after reaching age 15. Or in other words, average life expectancy, conditioned on having survived childhood, was 54 years. And, as you note, that figure actually decreased in the Neolithic and Bronze/Iron Age. Early civilization was seemingly harder living for adults than was the Paleolithic era.