The Audience Age Is An Important Factor
The age of the people who are listening is a big factor for creating conversational material, because older listeners can take more stuff during one best than younger ones can. Also, older listeners can have more information thrown at them than younger ones can. With younger listeners - kids - you are going to want to tone down the language that you use so they can understand you. With older listeners, you might want to change the slang or some of the words that you are using so THEY can understand the best possible speech topic.
Either way you will need to change the things that you are saying because of who you are speaking to. Therefore, you want to consider the age.
As any should know, the point at which one loses one?s audience is when audience participation is minimal, and that is usually when one is laying the dry, bare bones of the first draft.