SENESCENCE By N., Pam M.S. - April 13, 2013 1. The biological process of being old. 2. The condition of being old. SENESCENCE: "Senescence is the state of growing old." Related Psychology Terms IN VIVO BIOLOGICAL FACTOR BIORHYTHMS BIOLOGISM CATALYTIC VARIABLE ENTRAINMENT BIOGENIC MALADAPTATION SEX IDENTITY PROCESS SCHIZOPHRENIA Cite this page: N., Pam M.S., "SENESCENCE," in PsychologyDictionary.org, April 13, 2013, https://psychologydictionary.org/senescence/ (accessed September 21, 2019).