Andriasang: Here are some stats on Japanese game developer employment, as assembled in a report from Digital Content Association of Japan and passed along at Hachimaki.
Average salary: ¥5,184,995
Average age: 33.79 years
Average numbers of years worked: 6.59 years
Most common age group: 30s, at 52.8%
DCA also provided role specific salaries:
Network Engineer: ¥5,225,000