▁the ▁over wh el ming ▁majority ▁of ▁the ▁ob last ' s ▁population ▁( 9 3 . 6 %). ▁Eth nic ▁Rus si ans ▁are ▁the ▁distant ▁second ▁group ▁of ▁population ▁( 5 . 4 % ), ▁and ▁are ▁concentr ated ▁mainly ▁in ▁the ▁city ▁of ▁Ch erk asy . ▁ ▁The ▁ob last ▁is ▁primarily ▁Ukrain oph one . ▁ ▁Age ▁structure ▁▁ 0 - 1 4 ▁years : ▁ 1 3 . 4 % ▁ ▁( male ▁ 8 7 , 5 5 7 / f em ale ▁ 8 2 , 3 4 0 ) ▁▁ 1 5 - 6 4 ▁years : ▁ 6 9 . 1 % ▁ ▁( male ▁ 4 1 7 , 4 2 6 / f em ale ▁ 4 5 7 , 3 9 0 ) ▁▁ 6 5 ▁years ▁and ▁over : ▁ 1 7 . 5 % ▁ ▁( male ▁ 7 2 , 8 3 5 / f em ale ▁ 1 4 7 , 7 1 1 ) ▁( 2 0 1 3 ▁official ) ▁ ▁Med ian ▁age ▁ ▁total : ▁ 4 1 . 7 ▁years ▁▁ ▁male : ▁ 3 8 . 4 ▁years ▁▁ ▁female : ▁ 4 5 . 0 ▁years ▁ ▁( 2 0 1 3 ▁official ) ▁ ▁Econom y ▁ ▁The ▁economy ▁of ▁the ▁Ch erk asy ▁O blast ▁is ▁largely ▁domin ated ▁by ▁agricult ure . ▁While ▁the ▁winter ▁whe at ▁and ▁sugar ▁be ets ▁are ▁the ▁main ▁products ▁grown