not officially, there are kids that use their parent's account to buy and sell items, but since the payment options eBay has is not available to most under 18, a child would have to use a parent's account.
Yes, almost anything will sell on Ebay and Amazon.
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eBay technically isn't inappropriate for children, but it's not a children's website.
No - You must be AT LEAST 18 to use eBay. Transactions on eBay require the use of a debit or credit card. To quote directly from eBay's T & C's "To become a member of eBay, individuals must be at least 18 years of age."