The limits (scope) of the modification variability of an attribute of an organism is called its reaction rate. The reaction rate characterizes the ability of organisms of a given species to respond (within the genotype) to changing conditions and the possibility of manifestation of characters in particular conditions in a special way. The wider the norm of the reaction, the greater the deviation from the norm of the living conditions that the body can withstand.
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.