God said that wisdom does not come in the number of years old a person is,for if the wisdom is of God,then a 20 year old can understand as well as a 60 year old.
But of course a 60 year old might have studied the word of God more and has better understanding of it.
God said the wisdom of this world is foolishness to Him.
So if a person is 80 years old,who never followed God and the truth,but a man made religious belief,and ignoring the Bible,even though he is 80 years old,his wisdom would appear more foolish than the younger,for he would be more wise in the ways of the world,man's beliefs,in which the wisdom of the world is foolishness to God.
When it comes to understanding the wisdom of God,the number of years old a person is does not matter.
When it comes to understanding the wisdom of the world,the more old a person is,the more foolish their wisdom,for it is of the world.
But of course they might be more wise to relate that people should get along more and love each other,when older people tend to mellow out more,but their false beliefs and false religious beliefs are foolish.