Final answer:
Under Mississippi law, an individual is no longer considered a minor once they turn 21, making the statement True. Benjamin Franklin's establishment of an abolitionist society is historically accurate but unrelated to the legal question.
Step-by-step explanation:
The question pertains to the legal age of majority in Mississippi. Under Mississippi law, an individual is no longer considered a minor upon reaching the age of 21. Therefore, the statement that Ben is at least 21 years old if he is no longer considered a minor is True.
The statement regarding Benjamin Franklin is separate and irrelevant to the question about Mississippi law. It should be noted that, historically, Benjamin Franklin was indeed instrumental in the founding of the Pennsylvania Abolition Society, which was one of the first abolitionist societies in America. This is also True, but not directly related to the legal question about Mississippi law.