[mpeg]

Interesting, since they specifically say they do not use message content in the age inference I wonder if “AI” is smoke and mirrors here and the real way this works might be good old fashioned data buying.

Since they have my email, they could infer my age based on purchase history, credit cards, etc all which is available to buy through the usual ad data brokers

[WorldMaker]

That does seem to be the sort of heuristics they are implying.