One looks at the size of the population, which is projected to keep growing for a while. It keeps growing because people live for a long time.
The second looks at the age distribution of the population. What comes after the population peak.
Both are valid problems.
One looks at the size of the population, which is projected to keep growing for a while. It keeps growing because people live for a long time.
The second looks at the age distribution of the population. What comes after the population peak.
Both are valid problems.