But in a way, the article is begging the question by presuming that the categories are objectively meaningful. What's a 'teenager' and what's an 'adult'? If o

But in a way, the article is begging the question by presuming that the categories are objectively meaningful. What's a 'teenager' and what's an 'adult'? If our brains are continuously changing throughout our lives, you'll see differences on either side of any arbitrary cutoff point.