At What Age Do Your Breast Stop Developing?

Growth is finished at an early age but changes continue throughout your life. Weight loss/gain, genetics, pregnancy, and age can all affect your breasts over a lifetime.

Hi, thank you for your question. 
In most women, the breasts will begin developing with the onset of puberty, which occurs at approximately 9 years of age. By age 14, the breasts have reached their mature borders, but they continue to enlarge until the late teenage years and sometimes into the early twenties. Development of breast shape depends on a number of factors, including fat content, volume, muscular & skeletal contour and the skin/connective tissue surrounding it.  The final breast shape and size are dependent on your genes and will change with age as the supporting ligaments that hold the breast in place become lax and most of the actual breast will be replaced by fat. This means that the breasts become more ptotic (droopy). This process may be expedited with the changes that occur during pregnancy, lactation and breastfeeding. 
I hope this answers your question sufficiently. 

This is a greatquestions as often patients are eager to have their breast augmentationperformed, but don’t want to have it done to early.
Women’s breaststypically stop developing by age 16 or 17. I typically will not perform a breast augmentation until patients haveare at least 18 years of age. This waypatients can be fully developed prior to any elective surgery. Occasionally in younger patients that havecongenital deformities of the breast I will perform reconstructive surgery at ayounger age.
I hope thisanswers your question please consult with your board certified plastic surgeon.

The breasts typically stop developing between 18 and 21 years of age.  Of course there are many variables, and each person is different.  If by age 21, your breasts are underdeveloped, it is not particularly likely that the size will increase much more.

For the majority, breast development is considered complete by age 18-20. During puberty, which usually begins between ages 8 and 13, the breasts start developing under the influence of hormones like estrogen. Growth can continue throughout adolescence and may slow down once a person reaches their late teens. However, breast tissue can change based on genetics, age, pregnancy, breastfeeding, and weight and hormonal fluctuations, even after the primary development phase is complete.
Krishna Vyas, MD, PhD, MHSHarvard, Hopkins, & Mayo Clinic Trained Aesthetic Plastic SurgeonNew York, New York

Breast development typically concludes around the ages of 17 to 18, marking the end of puberty. However, it's important to note that breasts can continue to change in response to factors such as weight fluctuations, hormonal changes, pregnancy, and aging, and some may notice changes into their early 20s.