From the Conference Board of Canada:
Canada has earned a steady “B” on this indicator for nearly five decades. Japan’s impressive increase in life expectancy has set a high bar for attaining an “A” grade on average in this decade, a standard that only Switzerland has met. Moreover, Japan, which had among the lowest life expectancies in the 1960s, has been a steady “A” performer ever since. Of the five top-ranked countries in the 1970s, only Japan has been able to consistently maintain its “A.” Switzerland lost its “A” in the 1990s, regaining it in the current decade.
The Netherlands, Norway, and Sweden, on the other hand, have all lost their top-ranking status.
The U.S. has also seen a decline in its relative performance. It earned a “C” in the 1960s and 1970s and dropped to a “D” in the 1980s, where it has remained.
More links and charts here.