every 20 years, have science advance enough to extend everyone's life by 30 years
(doesn't take care of things like getting hit by bus, but takes care of 'regular' life extension)
(iirc, there was some ted talk on this)
every 20 years, have science advance enough to extend everyone's life by 30 years
(doesn't take care of things like getting hit by bus, but takes care of 'regular' life extension)
(iirc, there was some ted talk on this)