The younger a person is, the less likely it is that they will have decisional capacity. When I suggested 12 as a potential threshold, I raised that because that is where the psychological evidence rests as being really the minimum possible for a person to have the level of discernment necessary. However, I have a great deal of faith in our health care assessment teams to determine whether a person is freely making a choice and if they truly understand it or not, so I'm comfortable with there not being an age limit here.
On June 6th, 2022. See this statement in context.