Most ladies are through growing in breast size between 15 and 16 years of age. The next change may be with pregnancy and breast feeding or with weight gain. Genetically, you may not be destined to have much growth.
Breast development is complex and multifactorial.A lot of this is genetically predetermined. Some people have breast tissue that is very sensitive to hormone stimulation while other individuals breathe do not respond to hormone changes as much.Best,Mats Hagstrom MD