I remember my parents, when I was very young, plus some of the farmers who took me to live with them after I lost my parents in 1939, pour their coffee into a saucer, blow on it to cool it before drinking it.
I also know the effects of drinking coffee as a young boy. I can not remember when I first started drinking coffee. I do remember that in Oklahoma on the farm that my dad owned, we got our house water from a cistern. Since my mother always boiled the water before we drank or used it in foods, we never drank plain water at meals. I drank coffee along with the adults.
I remember many times, when a neighbor or other friends saw me, a boy 5 or 6 years old, drinking coffee, they would tell me that drinking coffee would "stunt my growth".
I have drank coffee all my life and still do, every meal and between meals. But they must have been right. I am only slightly over 6 feet tall and I am sure that had I not drank coffee as a little kid, I might have grown to be 8 feet tall and made a fortune in the NBA.