In the best scenario, augmented breasts will drop, soften and sag in an age appropriate manner. So conditions such as pregnancy, lactation, weight gain, loss, excessive sun exposure may be expected to test the elasticity of the skin brassiere. By contrast, problems such as chest trauma, mastitis which predispose to capsular contracture, may produce firming, narrowing and distortion of the breast.
It's important to realize that cosmetic surgery operations do not stop the aging process, merely alter it, hopefully in a favorable manner. Don't worry, your breasts will age appropiately.