China
Sixty Years On was created in 1970.
sapphire
sexagenarian =A person who is 60 years old or between the ages of 60 and 70.
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The duration of Sixty Glorious Years is 1.58 hours.
Sixty Glorious Years was created on 1938-10-14.
Sixty Years of Arkham House was created in 1999.
A Diamond Jubilee [ or anniversary for a marriage] .
Celebrating 25 years of marriage is called the Silver Anniversary.
10 years = 1 decade . Sixty years is 6 X 10 years = 6 decades.
Sixty Years of Arkham House has 281 pages.