The title is very misleading and an example of linkbait. It should be something like "Can Employers Request Traits That Older Folks Are Unlikely to Possess?"
For example, if you ask for a native English speaker to write a newsletter, Joseph Conrad would not fit the bill(since he started learning English at 21 years of age), even though in terms of talent he would surely be leagues beyond any random native English speaker.
It's as much as you can't claim native to a specific country if you are not born/raised in that country.
I'm not sure how I feel about the issue, but it seems fairly appropriately titled and asking a narrow question. If I clicked on an article with the title you suggest, I'd expect a discussion of broader issues – manual labor's physical requirements as job criteria, for example.