question about female BCI breeding age and size

[Reticsrule]

one of my dads friends has a BCI that he wants to get rid of and he said i could have it for free if i want it. if i remember correctly the guy said that the boa was 3 years old and 4 feet long. i know that this is small for either sex but if it is a female would she be able to breed at that size and age? my male is somewhere around 4'8". is this too big to breed with her if she is only 4 feet? im thinking it is going to be too small but i have not seen it in person so for all i know it could be 3 feet or 5 feet. like i said i would have to get it probed to find out if its male or female but if it is a female would she be able to breed with my male?