I'm actually in uni at the moment doing a law/science double, so I'm around a lot of 20-23 year olds, many of whom are formidably smart, and much smarter than I. I do, however, think that 25s and under as a generation have a serious attention problem as a result of all the notifications and constant phone spam they get. For those at the top of the bell curve it's manageable (frankly I've seen students at the very top of my Law cohort successfully multitask in ways that conventional neuroscience says unequivocally are impossible), but I do have serious concerns about the rest of them. That inability to think deeply or to properly focus for any real length of time on things is going to be something that we as a species will have to grapple with in the next decade, and I think the effects are going to be terrible. That isn't to say that people over 25, or 45 for that matter, can't be or aren't affected by their phones, but the younger generation has never lived without these kinds of devices around them 24/7 vibrating and lighting up, so I think it's especially deleterious and problematic for them.