Proverbs 20:29 The glory of young men is their strength: and the beauty of old men is the gray head.
30 The blueness of a wound cleanseth away evil: so do stripes the inward parts of the belly.
This first verse shows us that young men are proud of the physical strength in their body they really do not care to seek the wisdom and knowledge of God.The beauty of an old man is his gray hair, for one because he has lived long enough to have it. Also at this time his life he is not worried so much about physical strength but is more concerned about the wisdom and knowledge he has acquired from God.This last verse deals with discipline. When children are disciplined sometimes it may leave a mark but it helps them to learn to be a better person later in life. When it talks of the inward strips it is talking about the punishment that is felt within our inner most being.We are supposed to see in the bruises and in the stripes that correction has come for the sins in our lives.