Final answer:
The average age of the population in a destination country for immigrants is likely to decrease due to the growth of the working-age population, often brought on by younger immigrants seeking employment.
Step-by-step explanation:
The average age of the population in a destination country for immigrants will decrease primarily because c) The working-age population grows. This increase in the working-age population can occur through immigration when the immigrants are predominantly of working age.
This demographic trend offsets the aging population by increasing the proportion of younger, working-aged people within the country. Immigration can thus have a rejuvenating effect on the population's age structure, as it typically involves the movement of younger individuals who are seeking job opportunities and have the potential to contribute to the host country's economy. Such a change in the age structure can influence a nation's economic development, labor market, and social services demand.
Countries that are more economically developed tend to have an aging population due to lower birth rates and longer life expectancy. However, when these nations attract immigrants, usually seeking economic opportunities, the average age can decrease if those immigrants are younger.
This phenomenon reflects the fact that many developed countries are facing demographic challenges, with a rising average age and a declining birth rate, necessitating the influx of younger workers to maintain economic vitality and support social welfare systems.