This research thesis examined the connection between subjective age and health, as well as subjective age and life satisfaction. Subjective age refers to the personal feeling of oldness or youth that an individual has about their chronological age, and it has proven to be a significant factor that can affect quality of life and overall well-being. The main objectives of the research were to determine whether there is a relationship between subjective age and the perception of one's health, as well as between subjective age and life satisfaction. Through literature analysis and this research, it was found that individuals who perceive their age as younger show a higher level of psychological resilience, better health, and greater life satisfaction. The research was conducted on a sample of 99 respondents, of which 78% were female, with an average age of 31.6 years, and questionnaires were used to measure subjective age, health perception, and life satisfaction. The results showed a negative correlation between comparative age and health perception, meaning that individuals who feel older than their peers report poorer health. Additionally, individuals with a lower cognitive age assess their mental health more positively, indicating the importance of the subjective feelings of youth for psychological well-being. The hypothesis about the connection between subjective age and life satisfaction was partially confirmed; while comparative age negatively correlates with life satisfaction, cognitive age did not show a significant connection. This suggests that the perception of aging compared to peers plays a more important role in determining life satisfaction than the internal feeling of old age. The research emphasizes the importance of understanding subjective age as a factor that can help create interventions to improve the quality of life for older adults. Recommendations for future research include larger and more diverse samples to further clarify the nature of these relationships.