The thing about Hunzas' longevity, though, is a little dubious because they did not (do not???) keep actual birth records...and so their ages were often estimated and varied widely from one year to the next, at least that's what I've read.
I think in general, the longest-living and healthiest cultures are normally dairy free or very close to it.
The Okinawains, who have actual birth/death records, are the longest-living people right now...could be partly because they really ARE the longest-living society as a whole, or, the longest-living who have also kept accurate birth / death records.
Anyway...they are mostly dairy free...alhtough not as entirely so as Japan, from what I've read. This is because of the influence of the big military base, u.s. military base, on the main island.
As far as raw dairy...I believe it is less harmful than processed...because the homogenization process, for one thing, separates the fat and changes the mixture around to the point of making the harmful proteins that cause allergy, the sugar that bothers people, etc., more bioavailable. Also, the Pasteurization process kills everything that walks, including the good microbes that normally compete with the bad stuff...probably why store bought milk goes bad very quickly (I hear...I haven't had ANY milk at all, let alone store bought, in my house for AGES and AGES). Supposedly, raw milk has the advantageous microbes that would actually turn aging milk into things like yogurt, kefir, clabber, and eventually farmer's cheese or curds and whey. All edible, at least. Storebought will only turn bad, stink, and make people sick if they consume it.
It seems to me that collecting milk from an animal is possibly unnatural, however, I can see how small-scale households with a few animals once milked cows who were feeding their calves comfortably...if they used this necessarily small amount of raw milk to churn butter, clabber buttermilk, make farmer's cheese, or whatever...I don't see that this would have necessarily been a harmful thing, alghouth dependent on the health of the cow...but people may have been more in touch with their own cow's health...plus, the cow's probably stayed healthier because they were grass-fed/hay supplemented.
Today...any raw milk might be more dangerous because even organic farmers who grass feed are likely to have crowded conditions that would lead to stress and diseases that would be easily caught in such living conditions.
Homogenized milk is dangerous because of the chemical rearrangement of its properties, making it much more likely to cause allergy, autoimmune disorders and all of that in anyone who conusmes it (cats used to drink milk from the barn///no problem. Milk from the store makes cats have diarrhea!)-- raw milk is taking a big chance, unless you have your own milk cow. Then...you wouldn't have that much, so you'd be very dairy-lite, as opposed to all the dairy and dairy derivatives ubiquitous in our food supply now.
Oh, and not to mention the danger of hormones, epsecially bgh...and that modern dairy cows are fed things deleterious to their own health, are in croweded conditions, and subject to many diseases, such as the above-mentioned leukemia virus and Johnnes, tuberculosis, and such...and Pasteurization isn't guaranteed to kill all of that. There are known clusters of leukemia thought by some to come from dairy as origin, as well as clusters of even things like bladder infections, etc...not ordinarily found clustering, and thought to come from bacteria which survived in certain batches of local dairy products that had been Pasteurized.