This depends on several things. Do plan to have a family? If you do then waiting until after you have finished having children may be wise. Obviously the second issue is if you are a candidate for breast lift. This can be determined by a board certified plastic surgeon. Dr. ES
Breast lift is an excellent operation for the right person. There are 3 incision patterns which are used depending on the degree of sagging. Minimal sagging can be addressed with a incision around the areola. If the sagging is more dramatic an additional vertical incision from the areola to the breast fold is necessary. Dramatic sagging can require the above incisions plus an incision which runs along the breast fold as well. Sometimes volume loss in the upper breast gives an appearance of sagging caused by volume loss. If that is the case a breast implant may be all that is necessary. Seek out a board certified plastic surgeon to help you understand your options. good luck.