This depends on what today is.
See the related link, "100 years ago today".
To calculate late the date, subtract 100 from the current year, and use the same date. For example, of today were July 5, 2015, then 100 years ago would be July 5, 1915, since 2015 - 100 = 1915.
If you were born before this date in 1997 you would be 13 years old, if after today's date you would be 12.
A person born in 1945 would today - depending on the date of his birthday - be 68 or 69 years old.
You would be 29 if you were born before today's date, and 28 if you were born after 1982.
If I was born on this date in 1954 I would be 56 years old
As of April 2011, someone born on this date would be 32 years old.
If you were born before this date in 1997 you would be 13 years old, if after today's date you would be 12.
As of today's date, April 24, 2011, you would be 10 years old.
On today's date, 1st September 2012, you would be 39 years old.
If you were born before today's date, 21. If born after today's date, 20.
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A person born in 1945 would today - depending on the date of his birthday - be 68 or 69 years old.
Assuming today's date of August 3, 2010, you would be 15 years old.
Given the current date of August 2010, you would be 63 years old.
As of today's date, December 17, 2009, you would be 14 years old.
Assuming a current date of June 11, 2010, you would be 36 years old. Updating date to October 10, 2010, you would be 37 and 1/6 years old.
They would be 65 today. As of January first (which is tomorrow's date) they will be 66 years of age.
As of today's date, December 13, 2009, she would be 23 years old.