The brain takes a long time to form completely. The wiring in a teenager’s brain is only about 80 per cent completed (which may not come as a great surprise to the parents of teenagers).30 Although most of the growth of the brain occurs in the first two years and is 95 per cent finished by the age of ten, the synapses aren’t fully wired until a young person is in his or her mid to late twenties. That means that the teenage years effectively extend well into adulthood. In the meantime, the person in question will almost certainly have more impulsive, less reflective behaviour than his elders,
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