69, but it depends on what month of the year they were born. But most likely to be 69
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2010-1940= 70 yrs old
He bcome 70 year old this year.
Calculated in 2010 the year of birth was 1940.
2017 - 70 = 1947 so decade is 1940's
If you were born on 12.12.89, you would be 20 years old.