Looks wise Alkanphel is very modern, so that puts him as being quite young - comparatively, which leads to a question of why other humans looked so primitive. So perhaps Alkanphel just remembers them. One of the implications I'm remembering though was that the Creators were here and created all sorts of life forms - lots of them! Some of which I believe went through several mass extinctions, which to me would imply that the Creators didn't like their first attempts and wiped them out. This is shown when Murakami is explaining the history of Chronos, which you could say is a human misconception of time but it also happens when Sho is in the ship in Mt Minakami. The ship shows him a lot of different life forms, including dinosaurs and life from the ice age about 10,000 years back. Then it shows him ape like humans. It's hard to say what they are. They could be Australopithecus afarensis which are about 3.5million years old. If you wanted to push it, you could say they were Homo erectus but I'd probably say Homo habilis. (yes, I went to Wiki for a quick time line search of human evolution.) The next page shows a bald modern human, but with a lot of species in the background, species that definitely have mass extinctions between them. Why do I bring this up? Just to say that the Creators were on Earth for a very long time and if they were responsible for one attempted mass extinction, then who's to say that they weren't responsible for the others? Whatever survives those mass extinctions has to be stronger than the others species that died. And that's what they wanted. (Which leads me to an off-topic and disturbing thought that there could have been several versions of Alkanphel or an Alkanphel type being to lead the others. T-Rex Alkanphel anyone?) What does this say about Alkanphel? I'd say that he's definitely not 3 million years old, unless they somehow came up with a modern human then had to evolve the rest, or the Creators evolved Alkanphel with the rest of the humans so that during Homo habilis' time, that's what he looked like. As has been said, it's difficult to say and I'd have to look through my manga a bit more to see more references. I know I'm forgetting some useful pages. Based simply off the way he looks, 300,000 years with the Ice Age that the asteriod caused being the most recent one, which doesn't necessarily fit with other evidence. But to take a bite at the cherry each way, you could say he's 2-3 million years old too but that makes him very young when he stopped the Asteriod. The implication from the what I got to check, is that it was a modern human with a Guyver that caused the Creators to leave. Which doesn't invalidate Alkanphel being 2-3million years old, just means that either they created him to be modern or they evolved him with the rest.