The "Graying" of the U

The "graying" of the U.S. population as it relates to healthcare means that

A) We are becoming healthier as a nation because older people are now exercising more.
B) Although our population is older, healthcare costs are reduced because we are healthier as we age.
C) The U.S. will be confronted with more chronic health issues because as we age, more chronic health conditions develop. This will result in more stress on the U.S. healthcare system.
D) None of the above