80 yr – Class of 1945
75 yr – Class of 1950
70yr – Class of 1955
65yr – Class of 1960
60yr – Class of 1965 (Sept 5)
55yr – Class of 1970
51yr – Class of 1974
50yr – Class of 1975 (July 18/19)
45yr – Class of 1980 (Sept 13)
40yr – Class of 1985 (Sept 12/13)
35yr – Class of 1990
30yr – Class of 1995
25yr – Class of 2000
20yr – Class of 2005
15yr – Class of 2010
10yr – Class of 2015 (Sept 20)
5yr – Class of 2020