Japan at present has one of the oldest population in the world and persistently sub-replacement fertility, currently 1.4 per woman. Japan's population peaked in 2017. Forecasts suggest that the elderly will comprise 35% of Japan's population by 2040. As of 2018, Japan was already a super-aged society, with 27% of its people being older than 65 years. According to government data, Japan's total fertility rate was 1.43 in 2017. According to the Institute for Health Metrics and Evaluation, University of Washington, Japan has one of the oldest populations in the world, with a median age of 47 years in 2017.