The current pace of population growth is the result of a strong and positive net migration.
The decline fertility and infant mortality, the increase life expectancy, more rapid among men, and the substantial immigratory flux are the remarkable aspects of the demographic evolution in Portugal.
The fall in the number of marriages and the rise in both the number of wedlock births and the number of divorces suggest the new familiar models in Portugal.
The aim is to study the patterns of demographic variables responsible for the major changes in both population size and age structure of the population and the inevitable consequence in its ageing.

keywords: fertility, infant mortality, life expectancy, migrations, demographic ageing.