Having the greatest age (6)
I believe the answer is:
eldest
(Other definitions for eldest that I've seen before include "Most senior of a group" , "First in the order of birth" , "First to be born" , "Most senior (E, not O)" , "Most old" .)
I believe the answer is:
eldest
(Other definitions for eldest that I've seen before include "Most senior of a group" , "First in the order of birth" , "First to be born" , "Most senior (E, not O)" , "Most old" .)