Better than 60%?
Depends on what you mean by success, and how long you wait. Sperm counts return to normal rates over 95% of the time if you attempt a reversal within 3 years. Even after 15 years sperm rates return to normal about 70% of the time. But the longer one waits there are other effects, including development of sperm antibodies, degradation of the vasal fluid etc. And these add up. Successful natural pregnancy rates after a vasectomy reversal are only around 75% before 3 years and drop to around 30% after 15 years.
thank you