Is it true that there are possibility of breast development until the age of 23 ?

Yes, but: "Breast development occurs in distinct stages throughout a woman's life, first before birth, again at puberty, and during the childbearing years. Changes also occur to the breasts during the menstrual cycle and when a woman reaches menopause." from the following Hopkins site with further details http://www.hopkinsmedicine.org/healthlibrary/conditions/breast_health/normal_breast_development_and_changes_85,P00151/