Question

aging populations can be a problem for developed countries because
there are fewer younger workers coming into the workforce.
most older workers demand top - level pay and full benefits.
many older people are skilled in manufacturing, not technology.
younger workers cannot find jobs when older people work longer.

Explanation:

Aging populations lead to fewer younger workers entering the workforce. This reduces the labor supply, which can slow economic growth as there are fewer people to drive production, innovation, and consumption. Older workers' pay/benefit demands (second option) are not the core systemic issue. The skill - tech claim (third option) is too narrow. And the idea that older workers taking jobs blocks younger ones (fourth option) ignores broader labor market dynamics like job creation and skill - based employment.

Answer:

there are fewer younger workers coming into the workforce.