Question: When did your kids get interested in reading on their own?

My 7yo just started actually wanting to read books instead of me reading to him. He's still very much a beginner but he's asking for books and getting genuinely frustrated when he doesn't know a word instead of just giving up. Should I correct him constantly or just let him work through it? Also are there good early reader series that don't feel completely boring? He's into dinosaurs and space stuff if that matters.