In less than 50 years, one-fourth of the Japanese population will be 65 or older, straining the medical resources of a country that enjoys one of the world's longest life expectancies, a report says.

A projection from the Population Research Institute at Nihon University also says the average Japanese male will live 78 years and the average woman 83.6 years by 2025, newspapers reported today.United Nations figures show Japanese men can now expect to live an average 75.4 years, and Japanese women 81.1 years.

Three times more Japanese - over 1.1 million people - will be bedridden by that year than are now, and more than 2 million will suffer from senility, the institute said.