Potty training is a significant milestone for both parents and children. However, there is no fixed age when a child should be fully potty trained. While some children may be ready at 18 months, others may not be ready until they are three or even four years old. It's important to understand that every child is different and may have their own pace when it comes to potty training. As a parent, it's essential to be patient and supportive throughout the process. With proper guidance and encouragement, your child will eventually master this essential skill.