Question: in parts of the brain mature in the process of us growing into adults

Iroise Dumontheil answered on 6 Nov 2016:

Our brain change all the time, even as adults, but the biggest changes are in the first few years of life, when babies are born, and during the first few years.
Researchers used to think that after age 7-8 that was it, not much change was going on in the brain after that, because the size of the brain was quite similar to the size of an adult brain.
But in fact using magnetic resonance imaging (MRI) scanner like the one I use for my research, we have discovered that the brain continues to change quite a lot all the way into adulthood, even in the 20s.
What is important is that as you say not all of the brain matures at the same time, some brain regions for example involved in seeing, touching, listening, mature earlier than others that are involved in more complex thinking, planning, controlling your emotions and your behaviours.
So yes the current view is that your brain is changing during development, until it reaches adult-type patterns of anatomy and activity.