Comment by rayiner

Here's the problem I see with both population decline and life extension: lots of research indicates that the creative peak happens from 20-40 or so. Geniuses rarely continue to be the same level of productive after that. In other words, progress is probably better served by giving two people the chance to live 50 years than one person the chance to live 100, though resource consumption is about the same. An aging society, one without new generations of people with new ideas, is not a vital and creative one. Progress is served by turnover.