People are giving kids tablets and smart phones much younger than 9. Some kids like 2-3 years old. On one hand the argument is that they will be ahead of the curve in terms of using tech. But at what cost? Maybe lots of social dysfunction when you're older.

The book recommends no phone or tablet until age 5.

But I grew up in the late 80s and 90s and I remember the days before the internet, and I've learned to use it just fine. We don't need to rush kids into it for sure.