Japanese Emperor Akihito, whose efforts to soothe Asia's bitter wartime memories have been central to his 20 years on the throne, said his biggest worry is that future generations in his country will forget the past. Akihito also told a news conference marking Thursday's anniversary of his ascension that he thought his father, the late Emperor Hirohito, was reluctant about the war that was fought in his name and memories of which still bedevil ties with China and other Asian countries invaded, occupied or colonized by Japan.