The finding was (56) on the pooling of several different sources of happiness data, including: two multi-decade happiness/satisfaction surveys (first launched in the 1970s), involving about 500,000 American and Western European men
and women; four rounds of the 80-nation World Values Survey (57) between 1981 and 2004 in North America, Eastern and Western Europe, Asia, Africa, Australia, and Central and South America; and a 2004-2007 survey (58) nearly 1 million Britons.
The bottom-line: For most people throughout the world, the highest probability for (59) striking is around 44 years of age.
In the United States, however, some as-yet unexplained (60) differences were observed, with happiness among men dipping the most in their early 50s, whereas women hit their nadir (最低点) around the age of 40.
The researchers cautioned that cheerful people tend to live longer than unhappy
(61) - a fact that might have skewed (使偏斜) the overall finding. But they also suggested that evidence of a happiness (62) might simply reflect a midlife choice to give up long-held but no longer tenable (守得住的) aspirations (志向), followed by a seniors sense of gratitude for having successfully endured (63) others did not.
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