From 1929 to 2010:
100 years ago is 1909, therefore it is the 20th century.
President William Howard Taft: 1909-1913
38 years ago
13010 years ago
42 years ago
fourscore and seven years ago means 87 years ago
Well, honey, if you're asking how many years ago 5000 years ago was, the answer is pretty straightforward. 5000 years ago was, surprise surprise, 5000 years ago. Time may fly, but math is pretty consistent.
1989 was 23 years ago.
2515 years ago.
2000 years ago
239 years ago.
It was 137 years ago.