Japan has the second-longest overall life expectancy at birth of any country in the world, at 84 years . The Japanese population is rapidly aging as a result of a post–World War II baby boom followed by a decrease in birth rates.  over 20 percent of the population is over 65, and this is projected to rise to one in three by 2030. The changes in demographic structure have created a number of social issues, particularly a decline in workforce population and increase in the cost of social security benefits. A growing number of younger Japanese are not marrying or remain childless. Japan's population is expected to drop to around 100 million by 2060. Immigration and birth incentives are sometimes suggested as a solution to provide younger workers to support the nation's aging population. On April 1, 2019, Japan's revised immigration law was enacted, protecting the rights of foreign workers to help reduce labor shortages in certain sectors.