If you think 16-year-olds are too young to join the army that is a valid opinion.

If you claim that data from neurology proves that 16-year-olds are too young to join the army that is a stupid lie.

We have thousands of years of history of 16-year-olds fighting wars, starting families, and being adults in every way, and doing just fine. Pretending that high-tech fMRI machines have now proved they are children is utter bullshit.