I've cringed at the idea of churches confirming pre-teens for some time. Most preadolescents, as far as I can tell, aren't asking the right questions, yet we insist on giving them the answers anyway.
Here's what Barbara Brown Taylor has to say about this topic:
Twelve was the traditional age for confirmation in the Episcopal Church, when adolescents were invited to confirm the promises made for them at their baptisms. It was their turn to decide, we told them. We had spoken for them when they could not speak for themselves choosing members in Christ's body for the same way we chose warm clothes and nourishing food for them. On the verge of adulthood, they now had the choice. Did they desire to live the Christian life?
Since it is difficult to say no to a question like that , most of them say yes. When the bishop came for his annual visitation they lined up before him for the laying on the hands. . .
Afterwards there was a big party in the parish hall, which many of those young people mistook as graduation. The first adult decision that some of them made was to not attend church anymore, which helped explain why so many grown-ups held adolescent views of faith. Sixth grade was as far as they had gotten in their schooling, which meant that many of them lived the rest of their lives as a spiritual twelve-year-old.
The same can be said of a lot of Baptists and Methodists I know.
Source: Leaving Church by Barbara Brown Taylor, p. 202.