No they can live to a much higher age than the average human can in modern times. The old ones would've found out ways to prolong life even longer as they got more advanced, and would've possibly found a cure for cancer and many other deaseses, so I assume they would pass down these traits to the new world in the end right? So with that being said, I'd say that the average life expectancy would rise much higher. But with the dangers of machines and that the fact that most of the people live in primitive soceities, thus being badly defended from machines and having shorter life expectancies would probably drop due to their primitive nature.