Introduction. The demographic aging of the Portuguese population is marked by an increase in the number of older adults. This growth is more pronounced in older age groups, reaching 75% in the group of people aged 90 and over. It is also in the older adults that disability levels reach more pronounced values. Objective: Analyze and compare the results of the 2011 and 2021 Census regarding disability in various functions of adults aged 65 and over. Materials and methods: The answers to questions about disability included in the 2011 and 2021 Censuses were analyzed and compared. The questions refer to vision, hearing, mobility, memory, bathing autonomy and understanding. The analysis was carried out by five-year groups (65–69, 70–74, 75–79, 80–84, 85–89 and 90 and over). The differences between men and women were compared. The results are presented as percentages of subjects in relation to the population in each age group analyzed. Results: In both Censuses, disability levels increase progressively with age. In 2011 and 2021, the most mentioned disabilities in the population aged 90 and more years are autonomy in bathing/dressing (28.21% and 41.04% respectively), mobility (20.88% and 21.10%, respectively) and memory/concentration (12.36% and 12.22%, respectively). When comparing the two censuses, it is possible to see that the percentage of people unable to see and hear decreases in all age groups analyzed in 2021. Regarding mobility and hygiene, only the group aged 90 and over has worse results in 2021. In the cognitive and communication dimensions, in 2021, the number of people with disabilities in all age groups will decrease. Conclusion: Globally, the results showing a trend in accordance with the theory of compression of morbidity. Considering the data in the older group and in relation to three of the functions evaluated we may be in a scenario of dynamic equilibrium. Political decisions on service planning in the health and social areas must take these trends into account.