I take the perspective that Baptism, Eucharist, and Chrismation are gifts, not something to be earned. Thus I don't see the reason to delay their administration to age 7, 12, or 16. In my view, all three of these mysteries (sacraments) should be administered as soon as possible, preferably shortly after birth.
Due to the nature of the mystery of reconciliation, I do think you have to delay that until a child reaches an age where they can understand what's going on. But I don't see why that would be an issue with Chrismation, Baptism and Eucharist.
Obviously this is an area where the eastern churches and the western churches have a different perspective. And that's fine.