simple age structure of populations is distinguished by organisms whose life cycle does not exceed one year, and reproduction occurs once in a lifetime and is timed to seasonal changes in the environment. These are, for example, annual plants, a number of insect species, etc. Otherwise, the age structure of populations can be complex.
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.