The gene pool of a population is constantly changing under the influence of various environmental factors. Firstly, this is due to mutational variability of the genotypes themselves, which form the gene pool. Secondly, the gene pool can directionally change under the influence of selection. In different groups of organisms, the variability of the gene pool is different, but in general it is quite high.
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.