I would say it's to old to be human. Unless it's some kind of Atlantians that left earth thousands of years ago.
I'm pretty sure it's not generation ship humans, at least.
Was just joking, it´s too early to make a point.
But tell me: How can you be sure of it´s age? There is some pretty fancy technology here, the moon surely never had an atmosphere, so the folks that built it should be quite advanced. They have levitatiaon tech
And it´s still working. So if it´s human it´s definitely not old, because if, it would have broken down already.