I guess the accurate answer is, I don't know who's the oldest for sure since I have more than one ball python obtained as adult. The one I've had the longest is a male purchased as an adult from a pet store August 3, 1979 (31 years). I have another male I bred which hatched July 17, 1983. The oldest female I have (at least whose age I know) hatched May 27, 1986.