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.
Not knowing when child support ends can catch you off guard, especially if you're the parent who is receiving the child support. In most states, child support ends when the child reaches age 18. Some states, however, allow child support to continue beyond 18 in certain circumstances, such as if the child is still living at home and attending high school, or if the child has special needs.