Life is too short for us individually. But I think it is interesting that life is probably just the right amount of time for us as a species, that is if evolution has successfully selected our proper genetic lifespan. If individuals live longer then the species evolves slower and it can not adapt as well. Evolution is measured in generations, not absolute years.

Of course the optimal lifespan will change over time. Today we aren't really facing so many physical survival challenges, but if we extend life longer then we may slow down our speed of innovation.