Answer:
Unable to care for them and lack of younger people in poulations.
Explanation:
Sometimes having a big aging poulation means there are less or a little bit of people who are able to care for them. Check out some sources which talk about the aging crisis in Japan
https://pulitzercenter.org/projects/aging-crisis-japan
https://www.japantimes.co.jp/opinion/2019/11/19/commentary/japan-commentary/economic-challenge-japans-aging-crisis/#.XnV5p5P0k6U
D. (Descuentos means discount.)
