I think that some points in this article are a bit misleading. Much of the focus is on an increase in the average life span of the population, of which a large portion can be attributed to a reduction in infant mortality and an increase in sanitation, or treatments of common disorders. However, for 100+ year lifespans and (optimistically) 1000 year life spans, we would need to drastically increase the maximum life span, which proves to be a much more difficult task in healthy individuals.