There is an amendment to the ballet section of the rules for DWC 2020,
Classes – KDB , JDB and SNB, Children, Junior and Senior duet/trio ballet any style - (non repertoire) , DWC will accept duets formed by girl/girl or boy/boy from the classical repertoire as well as boy/girl.
In the class KDPDD - Children duet/trio pas de deux/trois class – DWC will extend the age permitted in this category. Dancers can participate in a pas de deux from the age of 10 – 13 years but only dancers aged 12 and 13 are allowed to dance on pointe.
The updated rules can be found here : dwcworld.com/rules