Plus, SapientNitro says, it has the technology and expertise to make sure that all the back-end systems talk to each other, so that Marks and Spencer (a Sapient client) knows that a person who visits its mobile app has recently purchased outerwear and lives in a particular region, for example.
Your pediatrician, who is specifically trained to care for kids and teens, might be able to provide care for a little longer if your child is in college (usually until college graduation or age 21). But this varies from doctor to doctor, so be sure to ask.
If a child has a disease or is in need of constant medical attention because of an injury or there is no one except a pediatrician available, then the child would have no one else to see and would then go to a pediatrician until they are at least 18 if not 21 dependent on circumstances and location.