I just assume this is not related to age at all and rather an excuse to identify people. Is the real reason for tracking, greed , preparation for a world war or some of all of the above? Intention is the part I think gets lot more difficult to tease apart. It was clearly never about protecting small children as the technical solution for that is trivial [1] and non invasive for adults.
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[ 0.23 ms ] story [ 15.3 ms ] thread[1] - https://news.ycombinator.com/item?id=46152074