The purpose of the research was to study the features of voluntary attention ontogenesis in adolescents with essential hypertension (EH) in age-gender aspects. Materials and methods. We examined 98 adolescents with EH aged 10-18 years (59 males and 39 females). EH was diagnosed with 24-h ambulatory blood pressure (BP) monitoring using monitor Oscar 2 for OXFORD Medilog Prima. Ninety-seven healthy age- and gender-matched individuals were controls. All participants were divided into 3 age groups (10-12 years, 13-15 years and 16-18 years old). All children underwent a neuropsychological examination with the use of standard tests. All the differences were considered significant at p < 0.05. Results. There were no statistically significant differences in voluntary attention parameters in adolescents 10-12 years old in both the main and the control group. However, hypertensive adolescents aged 13-15 years had significantly decreased voluntary attention level in comparison with age-matched individuals in controls. Adolescents in this group spent much more time on testing and admitted a significant number of errors. In the group of older adolescents (16-18 years), the differences between the main and the control group continued to increase. Hypertensive girls have a tendency with better voluntary attention parameters than hypertensive boys. When comparing the tests results between the age groups of hypertensive patients, a tendency to their deterioration as the disease progresses is noted. Conclusion. The results of this study indicate the formation of a rigid pathological functional brain system in the ontogenesis in hypertensive adolescents with the development of brain structures decompensation and voluntary attention impairment.