Even if we stick with the more average 30-40 years, however, that’s quite some time for a pet – getting a ball python in your 20s or 30s can mean that the two of you will literally grow old together.With ball pythons, females are significantly larger than males. The latter usually only grow up to 2 or 3 feet (less than a meter) while females can grow up to 3 or 5 feet (up to a meter and a half).