Which demographic trend commonly leads to an increase in the number of elderly individuals in society?

The demographic trend that leads to an increase in the number of elderly individuals in society is the aging population. An aging population occurs when there is a higher proportion of older individuals compared to younger ones, often a result of increases in life expectancy and declining birth rates. This trend indicates that more people are living longer due to advancements in healthcare, better living standards, and improved nutrition. As the segment of the population aged 65 and over grows, the overall demographic structure shifts, resulting in a larger elderly demographic.

Other trends, such as urbanization, high birth rates, and seasonal migration, do not directly result in a rising number of elderly individuals. Urbanization may affect demographics and economic opportunities but does not inherently lead to an increase in the elderly population. High birth rates would typically increase the proportion of younger people, potentially decreasing the average age of the population. Seasonal migration refers to the temporary movement of individuals and does not influence the longer-term demographic distribution related to aging.