What is it called when your birth date is the same as your age?

When your birth date is the same as your age, it is referred to as a "birthday paradox" or "birthday coincidence." This occurs when you turn the same number of years old as the day of the month you were born on, such as being born on the 25th and turning 25 years old. It’s a rare coincidence that can only happen once in a person's life.