1859
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A "decade" refers to a period of 10 years, so three decades would be equal to 30 years. Three decades before 1969 would be 1939.
1958
30 years
If you mean 3/10 of a century then there are 3 decades A decade is 10 years and a century is 100 years
30
You are a year younger than me. Seriously though, you are 39 years old and 3 months. In some places you would be considered 40, in others 39.