7 & 8 years olds may enter only 25m events. 9 year olds in any squad & 10 year olds in LTS may enter only 25m, 50m & 100m events. 10 year olds in CB may enter only 25m, 50m & 100m events and 200m Freestyle. 10 year olds in PB may enter only 50m, 100m & 200m events. 11, 12, 13, 14, 15, 16 and Open ages may enter only 50m, 100m & 200m events.