Years

Age in itself means only that we are old, or young.  It is a quantity of years and says nothing of who we are.  So, being a child does not mean you are cute; that being old means you are wise; that being a particular age means you are anything but that age.  Having more years may mean you have more experiences, or have at least had the opportunity for a greater variety of experience, but it says nothing of whether or how you may have benefited from them.  It may even mean you have over time become more confirmed in your views rather than more open to variation.  Having fewer years could mean you are more aware, more willing to see, less bound to defend what once you thought or said, but youth can also be no more than the measure of one's immaturity.