Just to add- If you search “confirmation” here at CAF you will find a thread that deals with the very valid point that it is NOT the confirmand doing the confirming of baptismal vows, but the bishop (or a deputized priest) who confirms the confirmand’s baptism. It is not necessarily a rite of passage, or reserved only for young adults.
I was confirmed at 10, in the fourth grade. It is not hard to understand Confirmation. I would have it received it at a younger age, but the bishops did not make it to our parish that often. It was not unusual through the early 70s for children to receive First Confession and Communion in Second Grade, and be confirmed in Third. Children in Catholic schools in the Midwest are often confirmed in sixth, seventh and eighth grade.
I wish bishops in the Latin Rite would go ahead and switch to the same discipline as the Eastern Rite, which is to receive the three sacraments of initiation at one time, as soon as possible (babies). I’ll take a lot of flack for that one, esp. during First Communion time, but it simply makes more sense to me.