Since you are not specifying that it is on Leap Day, 1937.
As of November 2011, someone born in February 1975 will be 36 years old.
1931
On February 14, 2010 they are 56 years of age.
In March 2013, they would be 19 years old.
==1933==
February 29th, it only occurs once every 4 years!
Yes, someone can be born on the 29th of February. Since February 29th does not come around every year, they could choose to celebrate their birthday on February 28th, or on March 1st.
This would happen only for someone who was born in a leap year, on 29th February.
The composer in question, Gioacchino Rossini, was born on February 29, 1792 and died in 1868 at the age of 76, or 18 if you count his birthday only in leap years!
Calculated in 2010, their age would be seventy-three years of age.
33 years old in February 2010.
Rossini was born on Feb 29th - born in a leap year terefore he only 'had' a birthday once every 4 years.