Brain development and sense of consequences

This article (well worth the trip to bugmenot if you don't have a Toronto Star login) is really interesting. It postulates that adolescents have less of a sense of consequences because their brains are not yet fully physically developed. It gives some fascinating examples of trains of thought arising from not-yet-fully-developed children's brains, such as:

Ask a 4-year-old if he has a brother, and he'll tell you yes. Ask what his name is, and the child may answer "Jim." Then ask, "Does Jim have a brother?" The answer might be no.

The only problem about this theory of sense of consequences is that it does not correlate at all to my personal experience. The last time I remember my sense of consequences being different from what it is now was around the age of 3, when I honestly did not understand that if I made a big complicated mess my parents would have to clean it up. But, with the exception of things that require factual or experiential knowledge (for example, turning off a Linux computer without shutting down properly could fuck up the kernel, or mixing bleach and ammonia makes poisonous fumes), my sense of consequences has been about the same since age 9.

I wonder if this means my brain developed early, or if it means I'm still walking around with a child's brain. That would be interesting, if I were using a child's brain to do my (rather intellectual and cerebral) job.