The characteristics of the age structure determine many properties of the population as a system. A population that includes many age groups is less affected by factors that determine the success of breeding in a particular year. Indeed, even extremely unfavorable breeding conditions that can lead to the complete death of an offspring of a given year are not catastrophic for a population of a complex structure, because the same parental pairs participate in reproduction many times.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.