Final answer:
Approximately 30% of older adults live in assisted living facilities, with an average age of 80 years old.
Step-by-step explanation:
The correct answer is c) 30, 80. According to the information provided, about 30% of older adults reside in assisted living facilities. Additionally, the average age of these older adults is approximately 80 years old. The demographics of the U.S. population have shown a significant increase in the elderly population, with the percentage of people aged 65 and over steadily growing over time.