An age limit isn't necessary. Younger members who can't handle posting/doing transactions show themselves as such. Members who are <18 and have 50+ feedback don't need to identity their age because at that point it's irrelevant since they've already proven themselves to be responsible. In short, don't trust people who type poorly and seem immature in messages (and neither is hard to point out) if you don't want to deal with minors (or ignorant adults).
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