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Without being completely au fait with how straight forward the security side of things is, it does seem that maintaining just one table and have active links to photos restricted to just those who age verified, would be the simpler option to maintain. As it would be 1x table and 1x set of photos.
I do like ptHarry’s idea of a non age verified person having some sort of message prompting them to get verifed if they wish to see the photos.