Final answer:
Approximately 20% of the total health bill of the United States is for the care of adults 65 and over.
Step-by-step explanation:
The question is asking about the percentage of the total health bill of the United States that is spent on the care of adults 65 and over. According to the information provided, 20% of the U.S. population is over 60 years old, which means that almost 63 million people will need increased medical care. Given this information, it is likely that the answer to the question is A) 20%.