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.