You’re right we can push beyond that limit or even there (assuming that person actually lived that long, look up the controversy) with just diet or the biology

You’re right we can push beyond that limit or even there (assuming that person actually lived that long, look up the controversy) with just diet or the biology we know today. But as you point that’s nothing fundamentally problematic with the idea of our body being viable for hundreds of years with the right support. So I’m hopeful.