8 or 9.
I'd wanted video games to play, but my parents were pretty strict, so instead of letting me get e.g. Age of Empires, my dad handed me a floppy disk with a bunch of QBASIC games on it and told me "if you want to play video games so badly, build your own".
I spent a lot of time reverse engineering the games, which back then was easier IMO since the source code was immediately available when you started the game. Then I started by modifying the existing games, then slowly building my own (mostly text based) games.
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