Hi docs! wondering what age do boys penises start to develop?

Wide range of ages: I assume you mean develop during puberty. Typically, puberty begins between 9-14 in boys. The first stage involves the enlargement of the testes and scrotum. After this, the penis begins to lengthen and widen. So, a typical age range for this could be anywhere from 9-15, though they will continue to develop through the rest of puberty, which can last several years after this. Hope that helps!