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.

the answer is a. there are fewer younger workers coming into the workforce.

there are fewer younger workers coming into the workforce

Explanation:

The majority of the developed countries have problems with their aging population, and those problems will just increase more and more as the time goes on. The reason for this is that there are fewer and fewer younger workers coming into the workforce, leaving this countries with an abundance of open jobs, but no one to fill them in. Some of these countries have been trying to solve the problem with inviting more migrants, but they actually made themselves even bigger problem. Only small minority of the migrants that were taken to fix this problem are actually skilled to work in the positions where there's the largest need for workforce, while the large majority is not, so the problem remains and increases.

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