re: Would you be ok with 21 being the law, with Military exempt.

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Science tells us that the brain isn’t fully developed until you’re 25

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I literally don't remember anyone other than me ever discussing that fact on this board. Kudos to you, good sir

For those unaware, your prefrontal cortex is the last bit of brain to develop. It's responsible for long term planning, risk assessment, personal inhibition, and quite a bit of your personality. When you see cases like Miller v. Alabama come out, this is what they are based on.