The term 'up in years' is a phrase used to describe someone who is elderly or advanced in age. The crossword solutions for this term are OLD (3 letters), OLDER (5 letters), and AGED (4 letters). OLD is a general term used to describe someone who is no longer young, while OLDER is a more specific term used to describe someone who is significantly OLDER than the average person. Lastly, AGED is a term used to describe someone who is very OLD and has lived a long life.