Is it legal for me to play if the site accepts my deposit?

No. A site accepting your money says nothing about the law where you sit. Licensing binds the operator, not you, and offshore operators routinely take deposits from countries where they hold no local permission. Age limits and jurisdictional legality remain the player's own responsibility, and minimum ages differ by country and by product. The practical risk falls on you: an account opened against local law or with a false age can be closed and winnings voided at verification, and payment providers may block the transaction outright. Check your own national and regional rules before depositing, not after a win.