Why, is there evidence that the SIR 2 gene wasn't present in ancient humans?
I would be interested if the SIR 2 gene is also present in the chimpanzee. If it is, maybe it's God's way of indicating that ID is bunk and Evo is the path to knowledge. Just a thought.
I don't think the idea of an "intelligent designer" is bunk, I just think it is bunk science.
In any case, if we could prove the gene was absent in early humans, it might the beginning of research indicating that people once actually did live longer (more analysis would be needed, of course...) All wildly speculative musings, though, at this point.