Japan has higher than OECD average of adult with a tertiary education at 46 percent of 25 to 64 year olds

Picture: Japanese students

"Japan...has a highly educated adult population, with 46% of 25-64 year-olds having attained a tertiary education in 2011, up from 34% of 25-64 year-olds in 2000. This proportion is much larger than the OECD average (32%) and the third largest among OECD countries after Canada and Israel " 

Source: Education at a Glance, OECD, 2013, Japan Section

http://www.oecd.org/edu/Japan_EAG2013%20Country%20Note.pdf, page 4