Aim. The aim of this work is to compare personality traits changes and main symptoms changes in patients younger and older than 30 years during intensive, complex, integrative psychotherapy. Material and methods. Three self-descriptive measures: the 16 PF of R.B. Cattell, the Neurotic Personality Questionnaire KON-2006 and the Symptom Check-list O were used in the study. A number of 100 patients, both sexes, aged 20 to 58, performed psychological tests before and after psychotherapy. Results. Detailed statistical analysis shows that personality traits changes in psychotherapy do not seem to depend on the patients' age. We observe that decrease in global symptoms level is more frequent in the older patients. Conclusion. Our analysis shows that the KON-2006 is more suitable for research of psychotherapy effectiveness than the 16 PF of R.B. Cattell.