It is said than Vandal Savage is about 50,000 yrs+ old. He has assumed many prominent personalities in the past. So, are the greek gods and maybe even Amazonians aware of him? As he is immortal and can regenerate very quickly, he must've gotten their attention. So, are there any scans on this or something?

The Old Gods are much older.

closest thing you'll get is from Demon Knights.

^ And seeing how this features a blonde Hippolyta, it must have been retconned since that Themyscira has been revealed to be fake.

Well, I believe, as old as he is, and considering his powers. There should've been a feature with him and greek gods, and maybe some kind of confrontation with a minor god or two as well.

Several years after that panel was published and done by a writer who couldn't be bothered explaining why an illusion, made exclusively to fool Diana, could looks so different from the real Themyscira and still fool her, or how it seemed to exist hundreds of years before she was even born and fool the likes of Lucifer, Cain, Madam Xanadu and Merlin... none of which appears to have had their pasts retconned lately.

Anyways, I would imagine the Greek gods are aware of Savage due to how long he's been around, but that he's just beneath their notice. Like Apollo wouldn't give Superman the time of day, why would someone like him care about a longlived cockroach?
As for their respective ages... well again the New 52 is the only real lead on this. Savage, as we know, was a caveman thats just lived this long. The New 52 WW, had the First Born of Zeus, according to his solo-issue from the Villains Month he once ruled the entire planet in a kind of Hyborean/Forgotten Age, but then decided to be Kratos and challenge Zeus and brought just about everyone with him, he killed everyone else... and the result was a biblical level flood that killed the First Born's army before he was thrown into the centre of the Earth.
Savage could have been part of that army and simply played dead while Zeus dealt with the First Born. But alternatively Savage wasn't even born at this stage, since no one and nothing remembered the age of the First Born save the tatooes of the witch that was present at his birth. This ofc screws up somewhat on the notion of the First Born having spend a recorded 7000 years digging himself out.

@magian: Rucks rebirth run retconned everything to the point where most of Diana's New 52 stories don't make sense. Including the ones involving other characters. I know this is off topic but as good as he is, this is the kind of change I don't think writers should do.

Any idea what their ages are?

@outside_85: Makes sense. But I would assume that he would be considered a little more than a longlived cockroach, seeing as he supposedly have heightened intellect, along with all the experience and wisdom from all those years roaming amongst and ruling over the people. But still, your point makes sense.