How might someone live for thousands of years?

A long time ago during the last ice age an early hunter gather human encounter an unknown entity (likely a alien) who granted him the power of immortality with him living at least up into the middle ages. the question I want to know is (assuming this unknown entity doesn't return) by what means could someone achieve lich like power and live for thousands of years? and by what means could they sustain it?

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How might someone live for thousands of years?

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