You are welcome, also I saw you commented about rising radiation levels somewhere else earlier. I think this has been covered perhaps before you chimed in, a physicist claimed that the higher radiation levels, assuming they are actually recorded, could very likely be caused by the weapons used in the are and not reflect the true levels. I unfortunately don't have the necessary expertise to explain that further, but I assume it's simmiliar to smoking a ciggarette into a air pollution sensor.
edit: seems like you just asked for a source, I misread the comment chain
Anecdotal experience, but I am 5 years younger than you and recently bought myself a Titan Pocket, a small phone with a square screen and a keyboard, so that my phone would no longer be as exciting to use. So it's a very unusual device and whenever somebody I know sees it they ask me why I bought it. When I explain my reasoning most of the people my age seemed to understand my reasoning and also said that that they spend too much time on their phones. Out of the people few years older most of them did not express having that much of a problem with their internet habits.
I definitely think that unhealthy usage of internet is a problem of which the extend in society is not yet fully understood. Especially due the problems that come along with it such as depression and sleep problems. (Atleast in my experience.)
And I also agree on the traveling part, my usage was even more extreme with >8 hours almost every day since the age of 17/18, but whenever I travelled I did not have any desire to spend that much time on the internet. Probably due to the "quality" of feelings that one has when travelling and the ability to spend lots of time with a friend or loved one. (When not travelling alone)
edit: seems like you just asked for a source, I misread the comment chain