Abstract: AIM: The aim of the present study was to investigate the change in overall life satisfaction for different age groups and between genders over a 20-year period. METHODS: Data from 1984 to 2008 were extracted from a large prospective longitudinal health study of Nord-Trondelag (HUNT), Norway. The study included more than 176,000 participants ranging from 20 to 70+ years of age. Data were analysed using logistic regression and adjusted for gender. RESULTS: The analyses revealed an increase in life satisfaction for all age groups from 1984-1986 (HUNT 1) to 1995-1997 (HUNT 2), with the highest levels being reached at 2006-2008 (HUNT 3). For all age groups, the data showed an increase of about 20% for the period from 1984-1986 (HUNT 1) to 1995-1997 (HUNT 2). From 1995-1997 (HUNT 2) to 2006-2008 (HUNT 3), the increase in overall life satisfaction was 16% for the younger age groups, and about 32% for the older age groups (40-69 and 70+ years). Women's scores for overall life satisfaction were higher for nearly all age groups when compared to men using HUNT 3 as a reference. CONCLUSIONS: These findings suggest an increase in life satisfaction for all age groups from 1984 to 2008, especially for the older age group (40-69 and 70+ years). The data indicate that women score higher on life satisfaction for most age groups as compared to men.