@mattbrowne The pre frontal cortex changes throughout your entire lifespan it reaches physical growth capacity (weight) by the age of 25… Specifically the important part for teen to adult transition is the corpus callosum (white matter) and Glial connections (gray matter) (astroglia and oligodendrocytes, and capillaries) throughout will continue to develop, change, die, and reform throughout life.
Age however doesn’t necessarily prove that this region will indeed develop completely at all, or that due to trauma or illness that this region will ever develop.
25 is a number that acts as a basic overall mass populace calculation, or a basic statistic that is contingent upon many other factors for it to actually be the truth in all subjects.
And as I said, in some, depending on genetics and heredity, it happens slightly earlier and up until 25 as a baseline statistic number that again implies not maturity itself which is still psychological, as well as environmental but the physical event of the brain itself reaching its capacity for weight potential.