When Chazal talk about young wine and old it means this too. Perhaps even moreso.
Young wine still has pieces floating around. Ask a knowledgeable young person something and you get a not yet thought out response. As they answer they are still re-evaluating and qualifying their own words. All you get is a blur of terminology. Ask an older person, who went through this many times, and you get a fine, short response, like old wine that is very fine.
You might not think of yourself this way, but chances are if you just climbed out of things they are still not wrapped up on the shelf in a box. Every person has a unique prospective and angle. Just take a look at the Yediya and Bechira conversation and you see how everyone takes a different part of the question, and is therefore satisfied by a different answer. They try having a conversation together and nobody understands each other.
If you had the same thought for many years and brushed it against all kinds of counter-points, and brushed with it every other aspect of your life, then you are ready to pour your cup of refined wine into the cup of the thirsty.