Hallowell and Ratey, who write about ADHD, suggested a new entity for the current world: VAST, the variable attention stimulus trait. It is like ADHD but it is culturally induced and not presumed to be due to an innate deficiency in executive function.
"Beyond the sources of biologically based ADHD, there are a lot of people who act as if they have ADHD but on close inspection turn out not to have the diagnosable condition. These are the people who have ADHD-like symptoms caused by the conditions of modern life. Their “ADHD” is a response to the massive increase in stimuli that now bombard our brains and our world....
"Modern life has trained our brains to go faster and faster, to do more and more, to receive and transmit 24/7, and to require constant stimulation—be it from movies, TV, conversation, even news, as well as the minute-to-minute living of our lives. Most of us can go no more than a few seconds without looking for a screen."
It is likely to me that different people have different breaking points, and so one person may recognize the introduction of the smartphone or debut of TikTok as the point where they lost the ability to focus, and another may date it to the rise of LLMs.
Hallowell, E. M., & Ratey, J. J. (2021). ADHD 2.0: New science and essential strategies for thriving with distraction—from childhood through adulthood.
The VAST thing speaks to me. I am capable of deep focus work but often am subject to constant interruption and multiple concurrent urgent demands. During a work week I get a lot done but often feel pulled in a lot of directions like I imagine ADHD might feel like.
During the weekends when I am not occupied with a task I often fall asleep. This happens on the first day or two of vacation also. After a few days my brain acclimates to the pace.
If somebody told me 25 years ago that in the future we all would have a TV on our office desk with 100 channels I would not have believed them. Yet ... the current situation is worse! Thinking of it in terms of mental disorders, I don't think that is going to help much.
Please also note that ADHD-like symptoms can present from sleep Apnea/UARS-induced sleep deprivation and the probability of having Apnea/UARS rises with age. Smoothly for men and a with a sudden jump after menopause for women.
So if you feel like you are getting more ADHD-like issues, do consider a sleep study. Early tells are easy: you often feel like shit in the morning.