MENSTRUAL AGE By N., Sam M.S. - 0 is the age of a concerned fetus which is calculated from the beginning of a mothers prior menstruation. MENSTRUAL AGE: "The menstrual age of a fetus is calculated from the beginning of a mothers prior menstruation. " Related Psychology Terms A Comparison of Maternal and Paternal Filicide CHILD PSYCHIATRY ADOLESCENCE (Theories) AFFECTIONAL DRIVE PMDD: Can It Be Cured? Piaget’s Theory of Cognitive Development GESTATIONAL AGE PRENATAL DEVELOPMENT EARLY INFANTILE AUTISM OEDIPUS COMPLEX (Oedipus Situation) Cite this page: N., Sam M.S., "MENSTRUAL AGE," in PsychologyDictionary.org, April 7, 2013, https://psychologydictionary.org/menstrual-age/ (accessed June 28, 2022).