A girl's nose typically stops growing around the age of 15 or 16.
During adolescence, the nose undergoes significant changes in shape and structure. This growth spurt is part of the overall development process as a girl transitions into adulthood. By the mid-teen years, the major structural development of the nose is usually complete. While there might be very subtle changes later in life due to aging, the fundamental size and shape are established by this point.
It's important to note that this is a general guideline. Individual development can vary, and some girls may experience slight variations in the timing of nasal growth completion. Furthermore, while the growth stops, the nose, like other parts of the body, will experience age-related changes later in life, such as cartilage weakening and skin elasticity loss, which can alter its appearance. These later changes are not considered growth in the same way as the adolescent development phase.
In summary, while individual timelines can differ slightly, a girl's nose generally reaches its adult size and shape around 15 or 16 years old.