Daddy, what fierce eyes you have. Everything is not all right. Mother will grow old and die or prove unworthy or exhibit her mortality in more subtle ways. The child himself will grow old, if he is lucky, and die. The Bible knows all this of course.
All people are grass, their constancy is like the flower of the field.
Christianity is not blind to the nightmarish aspects of life. The people of Biblical times in particular lived much closer to mortality and evil than we do. Public executions of a cruel and not unusual character were a common occurrence. When I lived for a summer in East Africa, almost forty years ago, I was horrified to see lepers with their fingers fallen off, and youngsters so deformed that they crawled upon the ground like crabs. But in Biblical times such sights were common.