Catechism

Growing up, our church began teaching the catechism in middle school Sunday School. Recently our current church had promotion Sunday, and all of these little six year olds got up and went through quite a bit of the catechism. You want to talk about one of the sweetest, most humbling sights ever . . . I almost started bawling until my own daughter--there was no nursery--began to shout "MEOOOOWWW" as she stood on the pew.

At what age did you begin to teach your children the catechism (if you did it)? Scripture memory?