Reportedly one of my first words was "hot!" after I stuck my hand on an electrical stove top burner that was on. I don't remember it. Scarred for life? What do you remember before age 4? Edit: ah, you meant physical scars.
>Scarred for life? What do you remember before age 4?
A 2 year old in my wife's mother's group got 3rd degree burns from tipping a hot cup of tea on himself. Luckily it missed his face, but his neck and chest are now permanently scarred (and disfigured). The child required 6 months of physical therapy because the burn was down the neck and under the arm so movement was affected due to scar tissue. Any liquid over about 60 degrees C is a very real hazard for small child.
It really depends on context. A closely supervised 3 year old "cooking" using very low heat without oil and without a boiling pot around? Yup that sounds ok.