First of five parts

When people turn 40, they have reached a milestone age and one that often entails various responsibilities beyond caring just for oneself.

Okinawa marks its 40th year Tuesday since the United States returned the prefecture to Japan. But for Jun Miyagi, Okinawa still has a lot of growing up to do to meet its various challenges.

"Okinawa still has many thorny problems, including the development of its economy and the debate over U.S. bases in the prefecture," Miyagi, who heads Fukkiko Kyogikai, a group of about 40 Okinawans born in 1972, told The Japan Times last week.