I'm going to have to disagree with some of this.
1) My boys are 8th generation dairy, we had a small raw-milk operation when they were teens, and made cheese. My large animal veterinarian father used to say in the 70s "if milk and eggs are so bad for you, why did all our ancestors live into their 90s?". I'm glad that "saturated fat" became "healthy" again. The boys are tall, athletic, strong, and uncommonly healthy. Allergies were unknown to us as kids (I sympathize w lactose-intolerant cultures, glad there's alternatives). "Dairy people" (generally northern Europeans, some sub-saharans) are similarly athletic and tall. The NBA is full of milk drinkers, but we'll get to "later in life" issues. You allege further that cow's milk has cancer-causing agents...well so do many other foods, and milk is so ubiquitous that you'd think this would be more well-known if true. Damn, I grew up with all dairy people and my Dad was right, half seem to reach age 90 (not sure if they are other factors at work).
2) Some of this may be "lifestyle choice". Milk, eggs, meat are high protein meals that favor athletic bodies (especially growing ones). There may be some trade-off in longeviity, but's that not clear.
3) I quit drinking 1-2 glasses of milk after high school, as a senior now, I average about 1/2 cup a day (coffee and protein shakes). I go along with a "balanced diet" for many reasons, and I eat more fruit/veggies, less meat, maybe 1 egg/day.
4) There is much recent news re: Protein and muscle mass needs for seniors (along with news about merits of anti-inflammatories). The two sort of work against each other, so kind of a dilemma.
5) I get about 75 gm/day of protein (eggs, milk, protein whey, dinner meat entre), but am careful to get over 30 gm fiber (fruit/veggies/some grain) to "process" all that protein. I take some anti-inflammatories, but rely on exercise (7 hrs/wk) to maintain muscle and create natural anti-inflammatory effect.
6) My question is, "how do seniors get all that protein without milk?" (note here that "protein whey" is a milk derivative...we used to have tons of it while processing cheese, now I pay about $10/lb for the stuff!) Yes, you can get protein from other sources (beans, nuts, rice), but milk, eggs, whey, unprocessed meat is easiest (nuts, beans, rice can cause GI tract issues if eaten in bulk).
7) I believe it comes down to a choice: a) non-dairy/vegans may live a few years longer but b) Protein lovers may have more quality of life (in any case, exercise for seniors is the gold standard)
8) I'm waiting for someone to set an upper limit for daily protein intake (for seniors). Many say my 75 gm/day "is not enough", but I fear that more will amp up immune system and be hard on kidneys/liver.
9) Some have commented on the merits of raw milk. My father swore by it, and of course my family drank it. I'm not 100% in favor (I believe it needs strict quality controls, right now too prone to bird flu) but I agree that if done right, healthier than pasteurized (better for gut biome...and you've gotta admit, much of the "probiotic" products are cow's milk based). There are things about gut biomes we don't yet understand, but I can tell you calves/babies on lengthier Mom's milk are uncommonly healthy.
10) My further thoughts are in these articles:
