Age Grades for Races – Juniors

Just to clarify what the age grades mean:
U9 = under 9 on 31 Dec 2014 (otherwise called 8 years and under)
U11= under 11 on 31 Dec 2014 (10 years and under)
U13= under 13 on 31 Dec 2014 (12 years  and under)
U15= under 15 on 31 Dec 2014 (14 years and under) 
U18 =under 18 on 31 Dec 2014 (17 years and under)
U20 =under 20 on 31 Dec 2014 (19 years and under)
ie: if you are 11 now but turning 12 before Dec 31st then you are U13
and if you are 14  now but turning 15 before Dec 31st then you are U18