Would be able to generate keys now that will be secure for a whole lifetime? For anyone older than about 40, even state-of-the-art crypto from the time of their birth has been broken. Will modern crypto hold up any better?

Does your name mean "big goldfish-shaped space ship"?

This is a great question. Possibly related: I don't know the answer. :)

Problem is, what if somebody steals that private key, or if you lose it?

The solution clearly goes on that direction, but this is not enough. And I'd really like to see this one problem solved before we have to start asking something like "and what if somebody takes control of your brain, or you lose access to it?"