1991 or 1992, depending on what month you were born. Those born in 1991 after the current date (28 August 2013) wil be turning 22 this year.
People turning 21 in 2018 were born in 1997.
If you are 21 in 2013, then you were born in 1992.
1990
2015 − 1994 = 21 Therefore, you would have been born in1994
1993
1988
R. Kannan was born on 1971-07-21.
Joseph R. Swan was born on 1878-10-21.
R. Clint Cole was born on 1870-08-21.
John R. Brooke was born on 1838-07-21.
Ebenezer R. Hoar was born on 1816-02-21.
William R. Terrill was born on 1834-04-21.
Frank R. Strayer was born on 1891-09-21.
R. Harold Zook was born on 1889-05-21.
U. R. Ananthamurthy was born on 1932-12-21.
P. R. Anthonis was born on 1911-01-21.
John R. Alison was born on 1912-11-21.