Age has nothing to do with being wiser. You could spend your whole life livin' next door to your momma, listening to AM radio and the Savage nation and become nothing more than an older Idiot.
Watch people as they age, eventually they get to a point where they can't handle new ideas, and they just shut down to the new ideas, and then you have somebody play the "respect your elders" card.
Look at the people in SI, who can't understand that life is changing, and the way we treat our resources in the 60-70's is a thing of the past, and we as a society have gotten wiser, and demand better for the resources we live in.
Hopefully we have moved beyond the whole "Man against Nature" thing, and eventually can get to "Man with Nature".
I would guess the bigger contribution towards wisdom, if required to list relevant factors would be
<UL TYPE=SQUARE><LI>Education
<LI>Distance from Momma's skirt (meaning the amount of new ideas and new people you have exposed yourself to.)
<LI>Cycles of Life (meaning have you been thru Ups and Downs in life, as you can learn as much thru the Ups as the Downs. All Ups, or all Downs, leads to a false sense of life.)
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