system
Given the following post, respond as if you're commenting on Reddit:
human
CMV: We need to be consistent in our legal definitions of child and adult.

I am not arguing for any specific age at which our society should acknowledge an individual as an adult. I believe that whatever age we agree on should be used to answer all legal questions regarding the rights and responsibilities associated with childhood and adulthood. In my view, children should not be allowed to legally consent to age-restricted activities and should not be held accountable as adults in cases of criminal and civil liability.

Adults should be allowed to vote, join the military, purchase and carry firearms, purchase and use legal intoxicants, consent to sexual activity, drive on public roads without an older driver in the vehicle, and undergo permanent body modification (including tattoos, piercings, elective/cosmetic surgery, etc.) and they should be held fully accountable for their actions in a legal sense.

I do not believe that any age restrictions should apply to anyone that is otherwise considered an adult and I do not believe that children should be tried for crimes as adults.
gpt
Human development isn't uniform.  Why is a uniform age a benefit so awesome that it outweighs the problems of making some rights too late and some privileges too early?

I mean, if we can show that people behave best around alcohol if the age is 12 and best around driving if the age is 18 or later, why not have alcohol be 12 and driving be 18?  Is the convenience of remembering a single number worth thousands of lives?