Grew older (4)
I believe the answer is:
aged
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">grew older</span>' is the definition.<br/ ><span class="explanation-format__explanation">('age' can be a synonym of 'grow older')</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for aged that I've seen before include "Ripened, matured" , "Grew older" , "Senior" , "Geriatric" , "Old or ancient" .)