Fix the grammar mistakes: At the same time, problems related to aging population have arisen and more will start to surface as time passed and this has raised concerns of the world.
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The problem of the aging population is a global problem. The world population is growing at a rate of 1.5% per year. The world population is expected to reach 9 billion by 2050.
The world population is expected to reach 9 billion by 2050.
The world population is expected to reach 9 billion by 2050.
The world population is expected to reach 9 billion by 2050.