But I won't interfere in their personal lives after they turn 18. If my child tells me at the age of 18 that they want to move out of the house and move in with their partner, I would respect their decision. I am 38 years old now, never been married but getting married this year for the first time. If I do have child, I would be nearly 60 by the time the child reaches his or her 18th birthday.. I just hope that my husband and I live long enough to see them through high school at least..