It always looks to me like a petrified youth, a being that will never grow old in soul although its form has existed for centuries, and the stone it's made of for thousands of thousands of years.

That's an illustration of the saying that whom the gods love die young.

Not that they die in youth, but that they never really grow old, let them live for eighty years or more, as we count time.

They remain always young in soul, however long their bodies last.

Perhaps that's what Isaiah had in his mind when he talked about a child dying at a hundred.