| | Family Health | Pediatrics What is the average height for a 14-year-old UK boy? According to the UK Health and Safety Executive, the average height for a 14-year-old boy in the UK is 1.63 metres (5 feet 4 inches). Pediatrics - Related Articles Is It Time to Break Up With Your Pediatrician? What contributions to society has pediatrics made? Hot Tub Folliculitis in Children? Clindamycin in Children What is the average size for a 9 year old? What do boys like about being a boy? What supplies do you need for a children shelter?