This headline seems dubious on the face of it.
Did the study results actually show this? If so, could simply spending more time online account for doing worse on this test?
Also, just for fun, you can take the test here. I got two wrong and I have no idea which ones they were 😅
I agree - one of the obvious limitations of the test is that some of the more ambiguous headlines need more context before you can confidently decided whether or not they contain misinformation. Perhaps younger participants were generally less lucky in selecting the correct answer?