Juniors:
if you turn 20 during 2011, you are a junior until 12.31.2011.
if you turn 19 during 2011, you are a junior until 12.31.2012.
if you turn 18 during 2011, you are a junior until 12.31.2013.

Cadets:
If you turn 17 during 2011, you are a cadet until 12.31.2011 and then you become a junior on 1.1.2012.
If you turn 16 during 2011, you are a cadet until 12.31.2012 and then you become a junior on 1.1.2013.
If you turn 15 during 2011, you are a cadet until 12.31.2013 and then you become a junior on 1.1.2014.

Cubs:
If you turn 14 during 2011, you are a cub until 12.31.2011 and then you become a cadet on 1.1.2012.
If you turn 13 during 2011, you are a cub until 12.31.2012 and then you become a cadet on 1.1.2013.

Bowman:
If you turn 12 during 2011, you are a bowman until 12.31.2011, and then you become a cub on 1.1.2012.
If you turn 11 during 2011, you are a bowman until 12.31.2012, and then you become a cub on 1.1.2013.
If you turn 10 during 2011, you are a bowman until 12.31.2013, and then you become a cub on 1.1.2014.
If you turn 9 during 2011, you are a bowman until 12.31.2014 and then you become a cub on 1.1.2015.

Yeoman:
If you turn 9 during 2011, you are a yeoman until 12.31.2011, and then you become a bowman on 1.1.2012.
If you are 8 or under on 12.31.2011, you are a member of the yeoman division.

 

 

***Source:http://www.usaarcheryrecords.org/age.htm