In a stationary population pyramid, the age groups tend to be relatively stable, indicating that the population is not experiencing significant growth or decline. The correct analysis of a stationary population pyramid among the provided options is:
The younger generations are replacing the older generations at an equal rate.
This reflects the characteristic of a stationary population where birth and death rates are approximately balanced, leading to a stable population size over time. The other statements do not accurately describe the features of a stationary population pyramid.