I might vote for the 26 year old who just passed the bar but can't find work because I believe they know the law. My neighbor might vote for the retired high school principle because she believes the person has accumulated wisdom and experience dealing with people. Either person could be a great or terrible JP.
Also, don't forget JPs mostly handle basic disputes, misdemeanors, and administrative tasks. You probably don't need a law degree to conduct a wedding ceremony or hear a shoplifting case.
Would it surprise you to find out in lots of places the coroner is an elected position open to high school grads?