Personally I waited until my female was a little over a year old. I just wanted her to be of prime condition before the stresses of producing/laying eggs. She did not start developing eggs until after her first mating period. My second female is 2 years old and I still have not mated her yet and she still hasn't produced infertile clutches. I am trying to time it right so I don't have too many eggs incubating at the same time. I would recommend a year if this is your first experience with breeding....just my opinion.
-----
Experience and appreciate nature's creation.
www.zenexotics.com