No but not recommended after dark if they are younger .
There is not a specific age limit. If he is old enough to be left alone at home reasonably, he should be safe.
No there's no age limit he will be okay
Theres no age limit but if it makes you feel better tell him to call you or you text him. If hes under 15 I probably wouldnt send him without an adult for many reasons. Also there is safety in numbers. I have no idea why but young people seem to really enjoy malls lol.
No he should be fine. There's security on very where as well. Anyone can go.
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