So if the natural life span is about 100, why not get there intact? Is it really extending the natural life span or achieving the natural life span in relatively good shape what is motivating the whole stem cell thing. I don't see it as selfish to want that and don't see wanting that as being harmful to our children et al. Unless of course they just want our money and want to have less payout of benefits to old people. And that is understandable but craven. I prefer my craveness to theirs any day.