I like the concept that because we decline in liquid IQ as we age, so our static skill growth is always counterbalanced by our intellectual decline, we have never even seen a human being in the fullness of its power.

Well who knows. My bet is on the very long-lived being fairly risk averse. And new ideas are risky.

That is silly. Some people are more adaptable than other and are able to change their mind through time.

What if every time you accept new ideas, your old self dies a little bit?

Our five year old self is already dead.

In the US at least, young people are a lot more risk averse than previous generations.

I think neuroplasticity is well known to have a physical basis. We can probably extend the neuroplasticity of young adult and early middle age into longer and longer timespans, but all you have to do is watch a teenager or young adult for a few days to see that the extreme neuroplasticity of very young people definitely comes with some drawbacks.

I don't think I would want a future immortal billionaire with access to accumulated generations of power to enter a new adolescence with the brain reset that comes along with it.

We need young people to be stupid and brash and occasionally fearless and brilliant and unburdened by the lessons (or scars) of the past to keep society moving forward but those can't be the same people in charge of the world. There are roles for both.

Enough people deny their mortality that I doubt this is the case.