The purpose of the paper is to present the main findings on the factor structure of time perspective measured using the Polish version of the Zimbardo Time Perspective Inventory (Zimbardo and Boyd, 1999) in different age groups. A total of 2789 adults took part in the study. Confirmatory factor analysis of Zimbardo Time Perspective Inventory items was conducted in a group of respondents aged 18–78 years to verify the original five-factor structure. Separate principal component analyses were carried out for three age groups: 18–27, 28–39, and 40–65 years old. In the group of students, a fairly clear five-factor structure of time perspective was found. In the group of the oldest respondents, a three-factor structure emerged, which can be described as follows: Past-Negative combined with Present-Fatalistic, Past-Positive combined with Future, and a separate factor corresponding to the Present-Hedonistic scale. Differences in the factor structure of time perspective were interpreted in the context of developmental change.