If by this question you mean it's below-replacement Birth Rate then this is not just Japan's issue. It's not really a problem because even if the population declines on average at 1% a year it would take decades to have any real effect.
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what is the population of japan in 2009
In 2014, the population of Japan was estimated at 126,434,964.
The population of CGC Japan is 334.
Japan Post's population is 2,006.
Japan Tobacco's population is 2,011.
Sompo Japan's population is 16,095.
In Japan
No. Japan population = 126,434,964 US population = 320,206,000
No. Japan population = 126,434,964 US population = 320,206,000
No. Japan population = 126,434,964 US population = 320,206,000
The population in Japan is about 270 million people