I can't give you a number based on years. Obviously, as you said, it's early adulthood. It's outside of my area of expertise. I can't comment outside of age 18, because I only take care of children up to age 18. Therefore, my argument is that we should not have it for children aged 0 to 18. There should be complete prohibition.
Above that age, it's out of my scope of expertise, so I cannot comment.