More advanced in years (5)
I believe the answer is:
older
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">more advanced in years</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for older that I've seen before include "as we all will be tomorrow" , "Less young" , "More elderly" , "More senior" , "Increasingly mature" .)