Age Of My Ball Python

I have a beautiful female Ball :)
Am trying to figure out roughly how she is. It says on her feeding sheet that came with her from the pet store the arrival date but does anyone know how old a baby ball is when they are ready to be sold or arrive at a pet store???

When did it arrive at the store? a lot of pet stores sell babies no older than a few weeks.

I arrived at the store on jume 30th and shes still pretty small but growing fast.. She has shed three times since june 30th