This is 2015, so the year 1916 was 99 years ago. You'd need to specify a date to see if it was actually 100 years or only 99 years ago.
5000 years ago
72 years
38 years ago
13010 years ago
1.8 million years ago
42 years ago
fourscore and seven years ago means 87 years ago
If They Lived 500 years ago It WAS 500 years ago
49 years ago (as of 2017 !)
About 500 years ago.
558 years ago.
2000 years ago