Earlier quoted context omitted.
You're right, as is your parent comment, in saying that this isn't something only the young suffer from. In fact it's everywhere; the people with the worst smartphone addictions near me personally are an 11 year old and a 70 year old... That said the message, when taken as a general progression between how life was then and how it is now, stands.
The same thing happened with TV in the 80s/90s. It will eventually fix itself, Gen Alfa will grow tired of smartphones when they will be in their thirties, I'm pretty sure. (that doesn't mean that there should not be active campaigning to point out the risks of smartphone addiction)
TV use was higher in the 2000s than it was in the 1980s/1990s. TV viewing hours steadily rose from 1949 until finally peaking in 2010.[1]
But when TV finally peaked in 2010, did overall screen time go down? No. It kept going up.[2] Obviously, this is when the masses went all-in on smartphones, social media, and the internet.
Screen usage basically never went down. It has only gone up.
So I only see anyone getting tired of smartphones and actually using them less if they've found something more addictive to replace them.
[1] https://cdn.theatlantic.com/thumbor/3FzEghXwS-KkIYu1KwG-YyHh... (from https://www.theatlantic.com/technology/archive/2018/05/when-...) [2] https://www.brookings.edu/articles/how-free-time-became-scre...