How old can a female BP be and still produce viable eggs?

[XSReptiles]

Sure, but as with most aspects of breeding, there are many general rules.

So what would be the "general rule" for when a female will stop producing.

inb4 death lol

I wonder if ball pythons have been bred long enough for there to be answer to your question. Ball python breeding didn't really kick off till the 90s.