A population is a collection of individuals of one species having a common genotype and occupying a certain territory. For free-living forms, the distribution boundaries with respect to the territory are determined by such factors as topography, climate, etc. For parasitic organisms, the barrier to resettlement is fitness and life cycle.
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.