age and reproduction

Anyone know what age on average that a female ball will stop being able to reproduce??? If not, does anyone even have a ball park? 5 years? 10? 20?

Also, has there ever been any kind of study on reproduction related to life expectancy? In other words, a female who is bred and delivers eggs many times in her life.... would she live a shorter life compared to one who never delivered eggs?

I'm pretty sure ball python females have continued to lay viable clutches in the 20's...

Some where I read/heard that a zoo had a 31 year old female laid a viable clutch. I will see if I can find it.