* After you take a look at the table, write down from the people of age group who watch TV most to people of age group who watch TV least in order.

Is the sentence above grammatical? Can I write a better sentence for that?

How about this?

After you take a look at the table showing how many hours people watch TV, write down the number of people of each age group, in order from most TV hours to least TV hours.

The sentence above is grammatically correct. However, you can write a more concise sentence by rephrasing it as follows: "Write down the age groups in order, from the highest TV viewership to the lowest, based on the table."