Boys may still grow taller after they change their voices. The change in voice does not necessarily coincide with the age of epiphyseal closure, but if the epiphyses have not yet closed completely, then boys may still grow taller after they change their voices.
Boys usually start puberty around the age of nine, and there is usually a significant growth of the thyroid cartilage, which causes the vocal cords to thicken and lengthen, resulting in a change in voice. At this time, if the epiphyses have not completely closed, then there is a possibility of further changes in height.
By consuming reasonable and balanced nutrition, preventing obesity, and exercising appropriately, you can also drink more milk, as the protein and calcium in milk are beneficial to height growth. The ultraviolet rays of the sun can promote the synthesis of vitamin D, which can help the body to better absorb calcium, and also help to grow taller.