[单选题]5) Which of the following trends has been observed in the world population in terms of aging?
A
People aged 65 and older will soon outnumber children under age 5 for the first time in history.
B
The world's population aged 80 and over is projected to decrease 233% by 2040.
C
The world's population is growing older, but at a slower rate than it did in comparison with the previous two centuries.
D
As nations have advanced economically, birthrates have increased in proportion to the growing world population.
