When I told a CCD teacher about my third grade Confirmation she seemed aghast and explained that kids that young are not able to understand the importance of the Sacrament. I told her that I remember the nuns telling me, in the third grade, that fear of the Lord was that kind of fear that makes you want to not do anything that might hurt Jesus. And somehow, I was too young to understand that very deep concept, as an eight-year-old.
It is not right to deny the gift of grace through Confirmation to young people who are totally able to understand what they are receiving.
I don’t really understand the need for people to understand the importance of a Sacrament, or have some particular knowledge about it, in order to receive God’s graces. If that were so, then the Church should have rejected infant baptism long ago. I would personally love to return confirmation to immediately after baptism, regardless of the age of the child. Knowledge will come in time.