If I were to write a speech about nutrition to three different audiences, how wo

If I were to write a speech about nutrition to three different audiences, how would I alter my speech for an elderly population, parents, and school-age kids?
If I were planning on giving a speech on nutrition, I would need to analyze the audience.
In this case, I would be giving the speech to an audience of three separate populations- elderly adults, parents, and schoolchildren.
Adapt the topic of “nutrition” to fit 3 of the possible audiences and determine What information you would change to fit each of the audiences you have chosen. (FOR A SPEECH)
What information would you change to fit each audience I selected (be specific for all 3)?
CONSIDER for a speech :
To whom am I speaking to?
What does my audience expect from me?
What topic would be most suitable for my audience?
How should I present the information to them?
How can I gain and hold their attention?
What kind of examples would work best?
150 to 300 words are required.
It should be well organized and free of any grammatical errors.
Written in complete sentences.
THIS IS NOT A SPEECH. Just a discussion post for introduction to public speaking class.