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Is 17 almost adult?

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SweetMae · 70-79, F
For some people, it may be.

A quote from Mental Health Daily:

At what age is the brain fully developed?

Although brain development is subject to significant individual variation, most experts suggest that the brain is fully developed by age 25. For some people, brain development may be complete prior to age 25, while for others it may end after age 25. The mid-20s or “25” is just an average age given as checkpoint for when the brain has likely become mature.
It may seem logical that those aged 18 to 25 are completely mature, the brain still is maturing – specifically the area known as the “prefrontal cortex.” Changes occurring between ages 18 and 25 are essentially a continued process of brain development that started during puberty. When you’re 18, you’re roughly halfway through the entire stage of development. The prefrontal cortex doesn’t have nearly the functional capacity at age 18 as it does at 25.
HannibalAteMeOut · 22-25, F
@SweetMae exactly, that's probably why the skull's sutures close at the age of 30!