Ordering a join fetched collection in JPA using JPQL/HQL

Given the below JPQL statement, how do I modify it so that the kittens in the resulting list are ordered by their age property?

SELECT c FROM Cat c left join fetch c.kittens WHERE c.id = :id

I've tried multiple approches but without any luck. This is esentially what I would like to do, but it doesn't work:

SELECT c FROM Cat c left join fetch c.kittens k WHERE c.id = :id ORDER BY k.age