Here's a good example:
The term "underage" varies on different countries often referencing to "age of majority", depends on what countries has it set, with the United States for example at 21 is considered an adult. On the other hand, medical science has placed adulthood at 25 years since that's when the pre-frontal cortex has been completed for the task of decision, its main function. Given that info, what would classify for this trope? For starter, the age limit for this trope purpose will be 20 when the term "teen" no longer appears when it age is mention. While an age being mention is optional, the work has to apply the existence of this trope.
The general gist is clear, but it's so far off standard English usage that it's difficult to read. Several paragraphs in this article desperately need rewriting, with this one being probably the worst of them.