An abnormally increased rate of skeletal maturation. Accelerated skeletal maturation can be diagnosed on the basis of an estimation of the bone age from radiographs of specific bones in the human body. The phenotype is Accelerated skeletal maturation (Human Phenotype Ontology id HP_0005616). Also known as: Advanced bone age, Early bone maturation, Premature epiphyseal closure, Premature epiphyseal ossification, Premature fusion of the epiphyseal growth plate.