I have never used octal numbers in my code nor come across any code that used it. I bet you have. According to the standard, numeric literals which start with zero are octal. This includes, trivially, 0. Every time you have used or seen a literal zero, this has been octal. Strange but true.
If you are making child support payments in Texas, the law generally requires you to do so until your child turns 18, which is the age that marks adulthood in the state, or when he graduates from high school -- whichever comes later.
Usually, parental obligation to pay child support also stops when the child reaches the age of majority. However, a child who is sixteen or older may be considered an adult in limited situations. For instance, in Ontario, a sixteen year old can marry if they have parental consent. Marriage of a child will automatically end any child protection orders relating to that individual.