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Our bodies recycle most of the cells over a period of a week; some faster, some slower. Can we really assign an age to ourselves, in that case? The question is whether the tree completely dies, and then the 'clone' arises, or if only part of the tree (the trunk) dies, and it replaces that with a new one. If we replace a fingernail, are we no longer as old as we claim? If a tree replaces the trunk, does that mean it is a new tree, now? That's the part we see, yes, but that's not the only part of the tree, after all.