I have heard that females will continue to breed for the duration of their adult life. I have also heard of some people who like to wait until their females are 5 years old before breeding them. From what I have heard, these females tend to produce larger clutches with more frequency.
However! This is just what I have heard in other threads similar to this one. That does NOT mean that I have any personal experience with the issue--but I wouldn't expect there to be any problem unless the female was just infertile, which would not have anything to do with age in this case. 9 is not exceptionally old for a ball python.
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