Answer :
Developed countries are facing challenges because their populations are aging due to decreased death rates.
What is an Aging Population ?
An aging population refers to an increase in the median age which is caused by a low fertility rate and an increase in life expectancy.
This could also mean an increase in the proportion of a population such that there is a larger number of older people to younger ones.
Learn more about Aging population at https://brainly.com/question/2806687
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