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.

Correct answer:

younger workers cannot find jobs when older people work longer.

Aging populations can be a problem for developed countries because younger workers cannot find jobs when older people work longer. Older workers are considered less productive than younger ones, raising the issue of whether an aging workforce will also be a less productive one.