Suppose in all types of medicine will be sufficiently advanced to enable very long life spans (many thousands of years +). I imagine that a cure for pretty much all diseases, disorders and morbidities would be developed (including those to combat aging). Nevertheless, these people will still be vulnerable to other risks (car crashes, being murdered, falling in the shower and so on). What would these people's attitudes towards these risks be?

One hypothesis is that since there is so much to lose, these people will be so risk averse that it will cripple what we consider to be normal life. Few will want to risk a very long life so few will want to cross the street, take up dangerous professions, or even drive or travel through space.

One counterpoint to consider is that if this hypothesis were true (that those with more life-years to lose are more risk averse) we would expect fewer young people than older people would be risk-taking. But obviously more younger people bungee jump, skydive and do generally riskier things than older people.

Perhaps the life-years risked by young people today are just too few for this risk aversion effect to really arise, but given a sufficiently great life-extension, it is plausible that having many years ahead will make people very risk averse.

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This has been put off-topic as opinion-based, but as an economist, I know that risk attitudes can be rigorously studied. Obviously my question is highly speculative (as are most questions on Worldbuilding) but I don't consider it necessarily opinion-based.

A comment suggested that humans might be irrationally risk-taking because (perhaps due to cognitive biases and other cognitive limitations) we fail take into account the far future. Moreover, it's quite common for people to fail to internalize 'tail-risk' (i.e. low probability events). However, I expect that this sufficiently advanced society could cognitively enhance themselves, and improve this ability. (To some extent this is already happening, with the development of useful concepts about rationality and risk).