Least advanced in age (8)
I believe the answer is:
youngest
(Other definitions for youngest that I've seen before include "Most immature" , "Ath the earliest stage of development" , "last to hatch?" , "baby" , "Least elderly" .)
I believe the answer is:
youngest
(Other definitions for youngest that I've seen before include "Most immature" , "Ath the earliest stage of development" , "last to hatch?" , "baby" , "Least elderly" .)