Mainichi Daily News, November 2, 2007
Officials have announced that the government is set to lower the age of majority -- the age from which one is legally an adult -- from 20 to 18.
The government will submit bills to revise the Civil Code and other relevant legislation to the Diet during an extraordinary Diet session in the autumn of 2009, or a regular Diet session in 2010, according to the officials.
(Full Story)
If anything I think they should raise the age to about 25! I suppose there are some mature 18yo Japanese out there...somewhere.