Organisms with a large number of offspring die more often, because parents do not care about their offspring, they do not have such a mechanism (property), they cannot protect it from enemies and unfavorable living conditions. Those living things that are cared for (fed, taught skills, protected) often survive, grow up and give birth to offspring.
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.