For breeding JCP, is it more about size or age with the males? I guess, how early could a male breed?

Males need to be at least 18 months and 1,000 grams. That is what I have read though, I have no experience with young males.

Might want to take a look at this, it might have the answer.
http://www.acreptiles.com/carpet_python_breeding.htm#Overview