Is 21 too old to be a doctor?

There is no age limit on becoming a doctor. In the United States, students who want to become doctors typically start college at age 18, after completing high school. They then spend 4 years in college, where they will study the sciences and other courses that will prepare them for medical school. Medical school typically lasts for 4 years, after which students must complete a residency program that lasts from 3 to 7 years. Therefore, the earliest a person can become a doctor is age 29. Of course, there are always exceptions, such as people who start college early or who take a break from their education. However, 21 is not considered too old to be a doctor. In fact, there are many people who start medical school in their late 20s or even later. Some people may find that they have a greater appreciation for the profession and are more motivated to succeed after having gained some life experience. Ultimately, the decision of when to become a doctor is a personal one. There is no one "right" age, and what is best for one person may not be best for another.