Not sure how the age matrix rules work? Here’s an update:

With the exception of Golf in which there are no gender or substitution restrictions, all events to be 50% male and 50% female competitors – the allocation for each age group is to be split evenly between male and female, i.e. if the matrix indicates 2 competitors from a given age group, one must be male and one female.

Age criteria is based on the age of the individual on 2nd December 2016.

There can be no substitutions over the 20-39 age-group, (eg 40 year old substituting for a 16-19 year old) and competitors in the 20-39 age group cannot cross out of their age group.

Team members aged 16-19 may be substituted up one level into the 20-39 age group, and those younger than 16-19 may be substituted up two levels.  E.g. a 17 year old can be substituted into the 20-39 age group; a 12 year old may be substituted into 16-19 age group but not into 20-39 age group.

Team members aged 40-49 may be substituted down one level and those older than 40-49 may be substituted down two levels.  E.g.  a 60+ may be substituted into the 40-49 age group, but not the 20-39 group.