First, the good news. We middle-aged Brits are no longer condemned to the conversation- and soul-destroying monomania of debating house prices.

Less good is what has displaced it – an epidemic of angst about when to allow teenagers a mobile, and what kind. I’m in the “very late and a brick” camp, but parents end up discussing the options for a smartphone-free childhood, inevitably, on WhatsApp.

There’s lots we don’t know about the effects of........

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