Re "... predict the date of your last day, would you want to know?" Interesting question - on the one hand it would be good to know so you could plan your life, finances etc. On the other hand, perhaps if significantly shorter (or longer) than vaguely imagined, that could be difficult psychologically. On balance - at this particular moment - I'd go for the specific day. After all you know that it is coming in any case. in terms of the genetic determinism of longevity, I thought it was significantly less (ie around 20%) important than environment (the balance) . That figure from David Sinclair of Lifespan from memory