der ly '. ▁Age ism ▁can ▁be ▁implicit ▁or ▁explicit ▁and ▁can ▁be ▁expressed ▁on ▁a ▁micro -, ▁mes o - ▁or ▁macro - level " ▁( I vers en , ▁Lars en ▁& ▁So lem , ▁ 2 0 0 9 ). ▁ ▁Other ▁conditions ▁of ▁fear ▁or ▁a version ▁associated ▁with ▁age ▁groups ▁have ▁their ▁own ▁names , ▁particularly : ▁pa ed oph ob ia , ▁the ▁fear ▁of ▁inf ants ▁and ▁children ; ▁ep he bi ph ob ia , ▁the ▁fear ▁of ▁youth , ▁sometimes ▁also ▁referred ▁to ▁as ▁an ▁ir r ational ▁fear ▁of ▁ad oles c ents ▁or ▁a ▁pre jud ice ▁against ▁te en agers ; ▁and ▁ger ont oph ob ia , ▁the ▁fear ▁of ▁elder ly ▁people . ▁ ▁Imp licit ▁age ism ▁Imp licit ▁age ism ▁is ▁the ▁term ▁used ▁to ▁refer ▁to ▁the ▁implicit ▁or ▁sub cons cious ▁thoughts , ▁feelings , ▁and ▁behav iors ▁one ▁has ▁about ▁older ▁or ▁younger ▁people . ▁These ▁may ▁be ▁a ▁mixture ▁of ▁positive ▁and ▁negative ▁thoughts ▁and ▁feelings , ▁but ▁ger ont ologist ▁Be cca ▁Le vy ▁reports ▁that ▁they ▁" t end ▁to ▁be ▁mostly ▁negative ." ▁ ▁S tere ot yp ing ▁S tere ot yp ing ▁is ▁a ▁tool ▁of ▁cogn ition ▁which ▁involves ▁categor izing ▁into ▁groups ▁and ▁att rib uting ▁characteristics ▁to ▁these ▁groups . ▁S tere ot ypes ▁are ▁necessary ▁for ▁processing ▁huge ▁volumes ▁of ▁information ▁which ▁would ▁otherwise ▁over load ▁a ▁person ▁and ▁are ▁generally ▁accurate ▁descript ors