Grew old (4)
I believe the answer is:
aged
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">grew old</span>' is the definition.<br/ ><span class="explanation-format__explanation">('age' can be a synonym of 'grow old')</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for aged that I've seen before include "not a modern copy" , "Like Uncle Arly" , "Advanced in years" , "Became older" , "Geriatric" .)