ср. childhood с детства – from childhood друг детства – friend from childhood
playfellow впадать в детство – to enter one's second childhood, to be in one's dotage, to lapse into dotage, to become senile
детств|о - с. childhood
~а from chiidhood
впасть в ~ enter one`s second childhood, grow* childish, be* in one`s dotage, become* senile