U.S. life expectancy surpasses 78 years

For the first time, U.S. life expectancy has surpassed 78 years, the government reported Wednesday. The increase is due mainly to falling mortality rates in almost all the leading causes of death, federal health officials said. The average life expectancy for babies born in 2006 was about four months greater than for children born in 2005. However, the United States continues to lag behind about 30 other countries in estimated life span, according to World Health Organization data. Japan is No. 1 on the list, with a life expectancy of 83 for children born in 2006. Switzerland and Australia were also near the top of the list.