The dot plots below show the ages of students belonging to two groups of music classes: A dot plot shows two divisions labeled Group A and Group B. The horizontal axis is labeled as Age of Music Students in years. Group A shows 5 dots at 6, 5 dots at 8, 3 dots at 9, 7 dots at 11, and 5 dots at 13. Group B shows 2 dots at 6, 4 dots at 10, 4 dots at 13, 3 dots at 15, 5 dots at 16, 4 dots at 19, and 3 dots at 21.

Based on visual inspection, which group most likely has a lower mean age of music students? Explain your answer using two or three sentences. Make sure to use facts to support your answer.