To me it doesn't even seem to make sense to have faces torn by age. I recall little to no wrinkles on the last Engineer's face, so what was he a child or a fan of Olay skin care? He looked oddly smooth and without any wear of age, which gave him a godlike appearance. This also implies that old age effects them just the same as us which, again, just makes them seem less special. Somehow that just crossed my mind now and not when we saw the first elder Engineer.