What makes a vasectomy reversal work?

What factors would make the success of my vasectomy reversal higher or lower? I have two friends who've had it; one worked and the other didn't. Why?

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I have had a vesectomy. Can active sperm be extracted for vitro without a reversal?

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My boyfriend is 45 years old and I am 24. We are considering having a child together. If he got a vasectomy reversal will I be able to have a baby?

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It has been over 15 years that I've had a vasectomy and I would like to have a baby. Is a reversal possable for me?