One of several rough estimates I've seen suggests that if you eliminated all biological causes of death, and left only accident and similar, that would bring the average lifespan to around a thousand years. Producing such an estimate seems straightforward enough, given statistics about causes of death.
As for how that might affect psychology: honestly, I'd love to see how the world might change if people adopted drastically different attitudes towards death, but I don't think it likely that this would produce far more risk aversion than we have today. Not least of which because I see no signs of tobacco companies going out of business.
For myself personally, I'm not going to stop leaving the house, but I certainly have no intention of taking up hobbies like hang gliding or motorcycle racing, any more than I plan to start smoking. (Side note: for an interesting measure of risk, see https://en.wikipedia.org/wiki/Micromort) I don't think that level of risk aversion qualifies as "a pretty frightened bunch not leaving home much".
As for how that might affect psychology: honestly, I'd love to see how the world might change if people adopted drastically different attitudes towards death, but I don't think it likely that this would produce far more risk aversion than we have today. Not least of which because I see no signs of tobacco companies going out of business.
For myself personally, I'm not going to stop leaving the house, but I certainly have no intention of taking up hobbies like hang gliding or motorcycle racing, any more than I plan to start smoking. (Side note: for an interesting measure of risk, see https://en.wikipedia.org/wiki/Micromort) I don't think that level of risk aversion qualifies as "a pretty frightened bunch not leaving home much".