Part VII of the Family Law Act 1975 (Cth), in its application to guardianship, custody, access and welfare, applies only to persons under 18 years of age (save for the express maintenance exception in s 66H). The Northern Territory Adult Guardianship Act 1988 is not excluded by or inconsistent with the Family Law Act in relation to persons over 18. Applications for consent to major medical procedures on intellectually disabled adults in the Northern Territory are properly brought under the Adult Guardianship Act, not the Family Law Act.
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