I am biased because I feel the world is overpopulated, but, yes, I think humans should have a reasonable life span.
Earlier this year, I read a report by, I believe, the U.S. DHHS that stated the U.S. has entered a period where for the first time, there are more people over 65 than five and under. I think that we are following the same trend as Europe and parts of Asia, where there is a very real issue with aging populations and lack of replacement population.
Eventually, or actually, within a few decades, the elder population will be a drain on resources, particularly without a replacement workforce.
Europeans are waiting longer to have children and producing fewer than in previous generations. I read the burgeoning replacement population is mostly immigrant; however, even immigrants are not producing enough children to mitigate the effects of an aging population on the state.
The U.S. is not quite at that point due to a higher birth rate, but even that is bolstered by births to foreign-born people, which is something like 20% of all births in the U.S., and seems to show a decline in native birth rates. Which makes me think in 50 years we could have a 50%+ majority of the population over 50, and really be unable to support that shift.
I’m not stating we should go all Soylent Green on people, but without death within a reasonable period, we need higher birth rates, to greatly raise the retirement age, and new industries to employ the large, multi-generational workforce. Without that a majority elder population will devastate the West.