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The DLR at some hours between some stops is practically a school bus.

I guess it's possible they're small but not <12yo

Are you calling 12y olds small? That is an age many female already have their periods. My youngest daughter is 12y old and almost 1m70 (5'7").

In some countries and even US states this is already an age you can marry.

Without court approval, no one under 16 can get married in any US state.