Abstract: In modern linguistics, research is actively developing aimed at cognizing the surrounding reality, verbalized by linguistic units of a particular language. At the same time, of course, interdisciplinary research, including both linguistic and extralinguistic data, is of particular value. The relevance of our article is the comparison of the concepts of YOUTH and JUVENTUD as fragments of the linguistic picture of the world of the Russian-speaking and Spanish-speaking peoples based on the synthesis of linguocultural and linguocognitive approaches to the study of concepts. The purpose of the work is to identify and compare the conceptual features of the above-mentioned concepts in Russian and Spanish linguistic cultures based on lexicographic sources and using extralinguistic socio-demographic data. The results obtained can find practical application in lexicographical activity. In our study, the conceptual features of the concepts of YOUTH and JUVENTUD were reconstructed based on the data of explanatory, encyclopedic, etymological dictionaries of the Russian and Spanish languages. The conceptual features of the mentioned concepts were identified by understanding the semantic scope of the names of the concepts: the lexemes youth, young in Russian and juventud, joven – in Spanish. Despite the fact that the concept of YOUTH was previously the subject of scientific analysis in the works of Russian linguists, a comparative study of the conceptual features of the concepts of YOUTH and JUVENTUD in Russian and Spanish linguistic cultures has not been conducted before, which is the novelty of the article. It was revealed that the coinciding conceptual features include: 1) a certain life stage of a person between adolescence and adulthood; 2) characteristic of youth; 3) the first stage of life / existence (about an animal, plant, phenomenon); 4) younger in age or time. It was also found that the period of youth for speakers of Spanish linguoculture covers a greater number of years, compared with the same period in Russian linguoculture, which is due to extralinguistic factors – a longer life expectancy in a Spanish-speaking society. In addition, for native Russian speakers, YOUTH is often associated with ‘immaturity, weakness’, while in Spanish linguoculture JUVENTUD is perceived as a period of ‘flourishing, strength, energy'.