1. I was 30.
2. Richard Dawkins.
3. I was fully convinced in about a week.
4.The book that really did it for me was The Blind Watchmaker. I started reading it critically to see if Dawkins would persuade me. He consistently pointed out that creationists misrepresented the process driving evolution, and had reasonable answers to their criticisms. In the end, I read about 2/3 of it.
5. I know biology somewhat better than before as I'm a Biology student and in my final year, and I'm doing well in my degree. But, TBH, I'm just a beginner.