Longevity in Nagoroh-Karabach

I wrote a lot here and i lost it all

This is a bit of an amalgam of different topics but it refers to an area of great longevity in a war-torn and poor autonomous region called Nagoroh-Karabach.
Search provided nothing relavent, so here is the topic.

I saw this on the BBC program 'Places that don't exist', which featured countries not yet ratified by the UN, this country is near Armenia, and has been the subject of a war between Christians and Muslims, although a ceasefire is currently in place.

Here is an extract from the show, talking about the longevity issue.

10.22.49
Simon Reeve
Despite landmines and wars, the people of Nagorno-Karabakh say there’s something special about this area which encourages a long life. They claim that if Nagorno-Karabakh was recognised as an independent country it would have the highest rate of longevity in the world.

10.23.04
Simon Reeve
Few outsiders have been able to check the claim because of the threat of conflict but to illustrate the pint David suggested we stop at a graveyard.

10.23.12
Simon Reeve
Look at these two. This couple, well the first one lived from eighteen seventy-seven to nineteen seventy-five.

10.23.25
David
Seventy-eight.

10.23.26
Simon Reeve
Is that seventy-eight? So a hundred and one and then eighteen eighty to nineteen seventy-five. So both of them were nearly a hundred. Look at that, there’s a
photo, a picture of them just there.

10.23.43
Simon Reeve
David was saying that he found a grave here once indicating that the person lived to be a hundred and thirty-six years old so we’re just trying to find it now.

10.23.55
Simon Reeve
So that’s a hundred and twenty. That person. This one. Eighteen twenty-two to nineteen thirty-seven. A hundred and fifteen.

10.24.09
David
The man lived hundred years, eighteen seventy-five, nineteen seventy-five and the woman eighteen eighty-five till now she’s alive. The wife.

10.24.18
Simon Reeve
She can’t be still alive.

10.24.20
David
Well come on, I, as I told you, Nagorno-Karabakh occupied the first place in former Soviet Union by number of people ageing one hundred and more years.
First place in former Soviet Union.

10.24.31
Simon Reeve
Do you seriously think that the, that the wife, the wife could still be alive? She would nearly be a hundred and twenty years old.

10.24.37
David
Yeah, yeah, yeah.

10.24.38
Simon Reeve
But you think she could be alive.

10.24.40
David
Yeah, yeah.

10.24.43
Simon Reeve
People from all over Nagorno-Karabakh are buried here so even if she was alive she could be anywhere.

Here is the url for anyone who wants to read the full transcript news.bbc.co.uk...

As it said, not many people can access the country to do studies on this claim, does anyone have any theories on what could cause this?

I have a few, either a special diet or unique genetics native to the region, or maybe something paranormal (a bit of a stretch).

I heard that stress during wartime would make peoples lives shorter however, and this region has been in and out of conflict for the last 40 years.

Would an increase in miscarriages due to wartime stress lead to this situation, sort of like a specialised survival-of-the-fittest?

Caloric Restiction is the cause IMHO. They've found the same in some famine stricken areas of the planet. Those that survive the famine are much more likely to lead much longer lives then people who live in a place where food isn't scares.