"I’m assuming the tournaments are in real time, so fifteen years from the start."
The MK team said 10 years passed between MK1 and MK:DA...however, Deception takes place immediately after DA and Armageddon is right after Deception. So probably eleven years have gone by since MK1.

"Reiko: 1,000,000+ (fought in Shinnok’s original war)"
They never specified which war Reiko fought in...the first one millions of years ago, or the second one that took place right before MK4. Just FYI.

"Reptile: 1,000,000+ (Last surviving of his species that became extinct a millennia ago, beside Kham)"
How do we know Reptile himself was alive when Kahn had conquered? We also don't know when Kahn conquered Zaterra. Also should be pointed out, the last of Reptile kind (aside from himself and Khameleon) died out between MK2 and MK3.

"Shao Kahn: 1,000,000+ (Merged Zaterra with Outworld around Shinnok’s original war"
The age okay, but Kahn didn't conquer Zaterra during Shinnok's war. Reptile's species originally inhabited Earth and it was Shinnok's war that drove them to Zaterra. Kahn conquered some time after that.

"Sindel: 20,000+"
I think it's worth noting Sindel wouldn't age while she's dead. Also worth pointing out her hair isn't naturally black and going gray. Her hair is naturally white...the black streak came after her resurrection. So theoretically, Sindel should still be fairly young (by Edenian standards, anyway).

"Daegon: 1,000+"
Daegon has to be older than that because he was awoken prematurelly and also he appears middle-aged. By looking at Kitana, 10,000 years old is apparently still young for Edenians.

Not bad guesses Brad. Only issues are:

-Reiko: The guy's been around for a long time, but not a million years. I'd say more along 40 thousand.

Onaga: That's way off. Maybe his spirit has lived that long, but his body has not lived for that long.

As for my guesses...

Jade: 10, 000+
Kai: 45
Quan Chi: est. 2 million - as old as the Netherrealm
Tanya: 15,000

.

A few more guesses...

Raiden=As old as time
Smoke= 34 (before automation) 44 (As of MKA, assuming that he aged during his deactivation.)
Blaze=200, 000
Kano=43

Mileena: Same age as Kitana
Shujinko: Really old?
Shinnok: As old as time itself
Frost: 22
Li Mei: 19
Kai: 39

We've already agreed that Jinko's 65.

Onward...

Nitara= est. 20, 000
Cyrax= 35 (Before automation) 46 (As of MKA)
Shang= 1, 023
Kung Lao= 42

Mileena was NOT created the same time as Kitana's birth.... so that's wrong.... just my two cents. :D

I wanna try a couple:

Raiden: As Old as Earth or in other words, "Eternal". I think he and Earth may have been created together, or one right after the other. But he's billions of years old though.

Shinnok: As old as time. He and the other Elders had to exist in order to force the One Beings un-consiousness.

Shang Tsung: EDIT:Correction, Shang Tsung is an Earth-born human with dedication to Outworld...More importantly though, he has consequential loyatly to Shao Kahn. So I'd say he's no more than a couple hundred years old. Maybe 300 tops.

Nightwolf: I always liked to believe he was in his 70's & 80's. He's a Shaman and a healer. These things are not so different from what Shang Tsung is, and how he stays alive so long. The biggest difference would be that Nightwolf probably gets some holy rites or immunities for performing miracles, and being so in tune with nature. He can turn into a wolf, and has some necromancy skills for example.

Nitara: Depends on what her rank//generation is, which I don't really remember. I'll guess she a few thousand years old though.

Her rank//generation should determine more things about her too. Like, intellect(experience, intuitiveness, ect) strength(how much she can lift), agility(she, as a young vampire, should've had trouble walking at human speed. They're supposed to have to tame their speed), and influence over others (the many ways of suggestion) for example.

I really wish they would research vampire folk-lore if they bring her back. And as such, have her combat and specials reflect how potent a source to the "purest" Vampire she is.

Specifically here, an easy reference to what I'm saying is that second "Underworld" movie. Where she sucks the older vampires blood and gets all his knowlege and strengths. Therefor allowing her to beat the big baddie.

Nitaras age matters alot.

Drahmin: I think he's around 100,000 years old. But for some reason too, I think he's older than Onaga. He's been through alot of changes it seems. Dramin>>Onaga>>Shao Kahn as far as the ruler of Outworld. That's merely an opinion though. Or speculation rather.

that's all for now.

Sub-Zero: 30?

Frost: 25

Sonya: 37

Kitana: (Human Appearance) 27

Jade: (Human Appearance) 27/28

Sindel: (Human Appearance) 41

.

Drahmin may be old, but an emporor? I wouldn't think so. And he's from Outworld.

Any one agree on the Edenian girl's appearance age?(how old they look if they were human?)

If there from earthrealm they will have average lifes. If from a different realm they have the chance to live longer

Yea, I never liked the character. Not even enough to continue playing with him past "just seeing what he could do" in the game. Not design, not moves, nothing.

But I'm purely interested in his backstory. The whole "used to be a warlord, and ended up in hell" and all. I wanna know who he was, when he was, and how he got where he's at in more detail than we've been given. Then, maybe, "what will he do next".

Next up...

Blaze: An eon at most, 5 million at least.

Jax: 46

Mavado: 35

Havik: Unable to be determined.

Hsu Hao: 40

Actually Shang could be around from minimally 500 to 1500/3000 years old. Shang was present when Goro, and the 500 year old history with the Laos..etc.

On another thing, historically he could be a Shang, as a chinese shang, than he would well be older than the general modern chinese empire it-self.

I wish the developers would specify. That would make him that much more interesting a character for me.

We'd be able to figure out from which phase he belonged to and everything.

I love the idea of Shang Tsung playing a role in the historical Shang Dynasty. If that is what you were referring to.

http://en.wikipedia.org/wiki/Shang_Dynasty

Actually, they DO specify what war Reiko fights for Shinnok in.

The first war, millions of years ago, was only between Raiden and Shinnok on Earth. Mortals may have been involved, but other gods were not, save maybe the other Earth-based ones like Fujin.

The war Reiko was "once thought killed in" in his MK4 bio, however, is specifically described as "the battle against the Elder Gods" and there was only ONE of those, and it took place immediately prior to MK4.

I'll tell you this, though. We know from Deception Konquest that Reiko was once in his life the General of Shao Kahn's armies, until, we can only assume, he died, since the next time we see him chronologically speaking, he's leading the armies of Hell and his eyes glow blue...the same blue as a wraith like Noob Saibot.
Problem with this is, he couldn't have been General any time during Shujinko's lifespan, because Goro was Kahn's General for all those years before MK1. So we have to assume it's just another of Konquest's little throwaway plotholes and in reality, Reiko served under Kahn sometime BEFORE Goro. That makes him at LEAST 500 years old, possibly over 2000, depending on when exactly Goro became General.
And to whomever brought it up, Drahmin was a warlord in Outworld, not Earth. Presumably either before Onaga's reign as Emperor, or during Shao Kahn's, because during Onaga's reign, all of Outworld was united tightly under one banner and there would not have been any "warlords" roaming the land.
And finally, Shang can't be much more than a thousand years old. His history is described enough to map out his life. He started out as an Earthrealmer who sided with Shao Kahn, competed in Mortal Kombat, and had quite a winning streak before being defeated by the Great Kung Lao. (How he was able to represent Outworld despite not being born there, we may never know. I suspect it has something to do with the reveal in Armageddon that Shang's soul is bonded to Kahn and that as long as the emperor lives, so too will he. Something like that, I'd think would cause the gods to view him as a "legal" citizen of Outworld from then on)
In the interest of drama, we have to assume the reason Great Kung Lao is such a famous hero is because that WOULD have been Shang's 10th straight tournament win, and Outworld would have conquered us, were it not for him. Now we know 10 generations of MK tournaments is 500 years, so right there, Shang is approximately...530, give or take a couple years.
Then he comes back with Goro and rules Mortal Kombat for another nearly-ten tournaments until Liu Kang comes along. So in Mortal Kombat 1, Shang Tsung is just a few decades over 1,000.
As further proof, his MK1 bio gives his age as "1000+", while Goro's age is a specific 2000. If they had intended Shang to be older than Goro, they would have given him a higher number. Obviously, they did not.

.

I couldn't find it with Google Image Search, but if anyone still has the concept art they released for MKDA, like the drawing of Moloch's owl, or that Kenshi sketch page with some Edenian proverb on it...the Drahmin concept art, where we see him being tortured in Hell, strapped to a monster's back and things like that, that page said specifically he was a warlord from Outworld.