You are totally right. Range would be a more accurate representation when life expectancy is up for debate. There is no doubt that the range has reduced greatly from what was obtainable during medieval period even though the average life expectancy has increased. I would say technological development plays a double edged sword role here. Much as it played a huge role in the increased life expectancy, it might also be implicated in the decreasing range in lifespan.
It is an honour to have you around here. Thank you for taking out time to read as well as leave such a thoughtful comment.