There is no definitive answer to this question as it depends on various factors such as the individual's height, weight, age and ethnicity. However, according to the National Health and Nutrition Examination Survey (NHANES), the average height for an adult male in the United States is 5 feet 9 inches (175 cm). This means that 5/8 would be considered slightly below average in terms of height for a man in America. It is worth noting that heights can vary significantly from country to country, so what may be considered average in one place may not be seen as such in another. For example, men in Indonesia have an average height of 5 feet 4 inches (163 cm), which would make 5/8 above average for them. Ultimately, it is up to the individual to decide if they feel their height is 'average' or not.