Get older (3)
I believe the answer is:
age
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">get older</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for age that I've seen before include "Plenty of time" , "Length of life" , "Period piece" , "Very long time" , "Long period" .)