I do have a solution. UKBF must replace their social workers with London bus drivers; these doughty guardians of TfL revenue can spot an overaged holder of a free-travel Oystercard quicker than a Buzzard spies a black shrew sunbathing on a white rock. They will certainly be able to weed out these fake kids.
The following tweet from someone using the online how-old.net app. No comment.