Nipponese adults female rested the world's longest-living last year, although their ordinary life expectancy butted down slimly to 86.39 years, the government said Wed.
The spill of 0.05 twelvemonths was the first declination in five classes, going down from a record 86.44 registered in 2009, the Ministry of Health, Toil and Welfare said.
"Last year's heat wave probably led to an step up in deceases resulting from high temperature shot and centre problem," a ministry functionary said.
Deaths from heat stroke reached a record high of 1,718, with 80 percent of those people aged 65 and older, he said.
Among countries and areas across the world, Japan ranked first for women's longevity, followed by Hong Kong at 85.9 years and France at 84.8 years, the ministry said.
The average life expectancy of Japanese men hit a new high for the fifth straight year in 2010, rising 0.05 to 79.64 years, the ministry said.
Japan placed 4th in militaries man's seniority below Hong Kong at 80.0 twelvemonths, Svizzera at 79.8 years and Israel at 79.7 years.