As i recall galactus was the last of hs race. he was a space traveler and he was there before the universe was born. and he was there when everything colapsed and gave birth to this universe. that is why he says he is older than the universe. before the universe collapsed he began to build his ship so he could survive. the watchers have been around longer than anyone and all they do is watch they can not interfear with oher beings. they are old. LOL i could be totally wrong on some points.