Meaning of Life and Psychological Well-Being during Adult, Older Adult and Oldest Old

Introduction: Adulthood is associated with many challenges which requires adaptability. Differences between adults and the older adults are important to adapt with these challenges and facilitators of adaptation. The present study aimed to determine the difference between the meaning of life and psychological well-being through different age groups of adults, older adults and oldest olds.   Methods: The present study is a causal-comparative study. Samples were 60 adults, 60 older adult and 60 oldest old men and women selected in Tehran through cluster sampling method and responded to Meaning of Life Questionnaire  and Well-being Psychological Scale. The data were analyzed by multivariate variance analysis.   Results: In psychological well-being, the mean scores of the adults group were higher than the other two group and the higher age means resulted in decreasing in psychological well-being. No significant difference was observed in the component of purpose in life and variable of meaning of life among the male age groups. The mean scores of the adult women groups were higher than the two other groups based on psychological well-being and meaning of life. Among the women, higher age led to a decrease in the average psychological well-being. Based on the findings, higher age leads to a decrease in psychological well-being and the meaning of life.   Conclusion: The findings indicated that psychological well-being varies among male and female age-groups. Therefore, further studies are needed to identify the resources which can help to adjust to going to ages and should be considered in mental health services to prevent the decline of psychological well-being and  meaning of life. In addition, the promotion of psychological well-being and the meaning of life should be considered in parallel with the life time.