The article itself talks of life stages in terms of how things change, with college life being a case study as a small aside in the middle of the article. It's written as though these insights apply to everyone, even mentioning the "International Association of Relationship Researchers" at the beginning.
It's a very common problem in sociology-type sciences, where they study college students because they're easy access, then extrapolate to the entire population.
The article itself talks of life stages in terms of how things change, with college life being a case study as a small aside in the middle of the article. It's written as though these insights apply to everyone, even mentioning the "International Association of Relationship Researchers" at the beginning.
It's a very common problem in sociology-type sciences, where they study college students because they're easy access, then extrapolate to the entire population.