If you own bunnies you'll make mistakes but if you love them as clearly you do they are well intentioned 'mistakes' or things to learn for next time. I think there is nothing wrong with your bunnies ages, once she is spayed & recovered they should be nicely matched on activity levels. Theres a really high chance they will bond when the time is right
What I wouldn't do is let him in her lounge. Its her space & she will be territorial over it & being removed to have another bun in there will make her anxious. He probably won'tcare so much. Until you are ready to bond I'd keep the lounge just hers, she'll be ready to share in good time but no boys in there for now
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