Seventy-four-year-olds are the most contented people in the population, according to new research.

　　一项最新研究表明，人在74岁时最幸福。

　　Fewer responsibilities, financial worries and more time to yourself leads to contentment previously unknown in earlier life.

　　人到了74岁时，肩上的责任变少，经济压力减轻，属于自己的时间增多，由此会感到前所未有的满足。

　　According to the report from the teenage years until 40 happiness declines. It levels offuntil 46 and then starts to increase until peaking at 74.

　　根据这项报告，人们的幸福感在十几岁到四十岁这一阶段逐渐下降，到46岁前趋于平稳，46岁后开始增强，到74岁时达到顶峰。