I'm only 5'5" tall, but I am quite strong. I move our feed sacks (50-lbs) around without too much trouble and can even throw a few 60-70 lb haybales, but prefer not to, of course!
At 8 lbs per gallon, a 5 gallon SS pot of milk would be just over 40 lbs. But, as I said, I don't normally lift the pot out until it is about half emptied, so about 20-25 pounds.