Wine improver
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">wine improver</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for age that I've seen before include "Mature, grow in years" , "Years lived so far" , "How long something has existed" , "Very long time" , "Plenty of time" .)