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so 18 is not the age anymore where the kid can make there own decisions on when to move out?
Under IC 1-1-4-5, an "Adult" mean a person at least eighteen (18) years of age.
However, IC 31-16-6-6 says:
Termination of child support; emancipation: (a) The duty to support a child under this chapter, which does not include support for educational needs, ceases when the child becomes nineteen (19) years of age unless any of the following conditions occurs: (1) The child is emancipated before becoming nineteen (19) years of age. In this case the child support, except for the educational needs outlined in section 2(a)(1) of this chapter, terminates at the time of emancipation, although an order for educational needs may continue in effect until further order of the court. (2) The child is incapacitated. In this case the child support continues during the incapacity or until further order of the court. (3) The child: (A) is at least eighteen (18) years of age; (B) has not attended a secondary school or postsecondary educational institution for the prior four (4) months and is not enrolled in a secondary school or postsecondary educational institution; and (C) is or is capable of supporting himself or herself through employment. In this case the child support terminates upon the court's finding.
So for child support, custody and support are governed by the child turning 19 - not 18.