This sounds very plausible. If I had to make a list of ways to identify a child, not yet having a cell phone would likely be on that list. I think I’d assume older people without one would be those who have limited internet activity, or none at all.

I don’t like this assumption, but so many things these days assume a mobile phone, and even a smartphone, that it seems hard not to have one. I need one just to login to my laptop for work. On top of that, a significant number of businesses I need to interact with have automatically opted me in to 2FA using text messaging. QR code scanning is being required more and more, even just to go out to eat.