Lifelong learning sustains an ongoing personal development and it should be analyzed with regard to its psychological premises. Any form of education not only enhances person's social and professional integration but also fosters his or her personal fulfillment and health. What personality trait forms or suppresses eagerness to learn at mature age? In this article we study the correlation between selected variables from «Life Long Learning Inventory» questionnaire and «Tolerance of ambiguity scale» developed by S.Budner (tolerance of ambiguity – novelty, complexity, or insolubility) and Ten-Item Personality Inventory-(TIPI) by S.D.Gosling (extraversion, agreeableness, conscientiousness, emotional stability, openness to experiences). 65 respondents at the age between 40 and 55 having over 10 years of work experience participated in the online questionnaire. The master's thesis consists of an introduction, three chapters, conclusion, a list of literature (104 sources) and applications, including forms of applied techniques, the classifier of associative connections, early research data. The volume of the master's thesis is 97 pages, on which are placed 29 figures and 6 tables. The introduction reveals the relevance of the research problem, the development of the problem, the purpose and objectives of the research, the object and subject of the research, the main hypothesis are formulated, the methods and the empirical base are specified. The first chapter include a review of foreign and domestic literature on the topic of the study: a description of the basic concepts and their characteristics. The first chapter include a review of foreign and domestic literature on the topic of the study. Conclusions on the first chapter are the results of the study of theoretical material. The two and three chapter is devoted to the empirical part of the study. On the basis of the obtained data, the developed models of intelligence and performance are demonstrated. In conclusion, the results of the theoretical and empirical parts of the work, as well as conclusions on the hypotheses put forward, the practical significance of the study. The results of our research demonstrate that readiness to acquire new knowledge at mature age is closely connected to extroversion, openness to experience and agreeableness.