Recently the Asahi News reported the following:
On January 1 the Ministry for Public Management, Home Affairs, Posts and Telecommunications consolidated an estimate on the population. New adults in 2011 who had newly attained adulthood this year were 1.24 million people (630,000 men and 610,000 females), and this ratio represented 0.97% of the total 127.36 million population. It was the first time since 1968 when the Ministry started the new adult population estimate that the figure was reduced to below the 1% mark. Up to now, the highest new adult ratio was 2.46 million (2.4%) of the 1970. It was the time when the first wave of baby boomers born in 1949 had attained adulthood themselves. Afterwards there was a decrease. The decreasing tendency continued until 1994 when it recovered to 2.07 million people, it was a time when people of the second wave baby boomers became adults. After 1995 the decreasing tendency continued. New adult in 2011 was almost half of the number at the peak. According to the population estimate, new adult in 2030 was expected to be 950,000 people, and would decrease down to 710,000 people in 2050. On the other hand, people born in the year of the rabbit was expected to be 10.08 million, 4.9 million men and 5.17 million women.
Probably Japan could consider taking up more immigrants from overseas.