Rukelion couldn't believe the truth about his feelings for Daisy was finally out in the open. It had happened in the most bizarre way.
Finding out her true age made a lot of things make sense. She didn't take him and later Ira in solely because she was kind. It was because her motherly instincts were coming out.
No wonder she had never expressed any romantic interest in him! What sort of grown woman would fall in love with a child?
He wasn't a child anymore though and he was determined to prove that to her eventually. War and his drive for revenge had hardened him past a point most adults would ever reach. He had essentially stopped being a child the moment Katalya fell even if Daisy hadn't realized that.
He truly didn't care how old she was. She was the only light in his life and new information about her couldn't change that.