Hello, my friend! If the elderly are not lactose intolerant, they can drink milk 2-3 times a day, that is, in the morning, at noon and at night. The amount of milk at a time is about 200ML, and the amount of milk per day is 400-600ml. Don't drink milk if the elderly are lactose intolerant.
What I said is for reference only. I wish you health and happiness!