While true, without advancements in modern healthcare, many of the disabilities people go through life with today would result in a much earlier death. Cystic fibrosis for example is to this day incredulously expensive to treat but with a much greater life expectancy than during the heyday of the Iroquois.
Yea don’t underestimate the impact of youthfulness here. I’d be willing to bet that the same work you do now wouldn’t have the same impact it does today.
Though I will say, working in UPS facility during college definitely left me exhausted most days. I was an athlete in good shape, but it was still a very taxing job. Kept me in good shape though, which certainly helped stave off any of the psychological impact of a sedentary office job due to physiological changes in my body.