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Someone smarter than me noted that all predictions of living forever always have one thing in common: it places the time when people start living forever within the lifetime of the predictor.

Aubrey de Grey is 43, and he's predicting that this might be in place in 20 years.

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Could you care to point out the number of correct predictions that take place well after the point of time they were made?

A number of Da Vinci's "inventions" were really just predictions of things that were invented much later (like his helicopter).

I think that's setting a low bar for "prediction" next to dated predictions like "In the next x years, we will be able to extend human lifespan by y years every z years."

I don't know that anyone can reasonably object to the theoretical possibility that an individual human life could be sustained indefinitely.

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