The Study Group on Forensic Age Diagnostics recommends various methods for age estimation in living adolescents and young adults. Among these, the evaluation of clavicular ossification has a decisive role as to the question of whether the ages of 18 and 21 years have been completed. There are many studies that investigated the time course of clavicular ossification by means of osteology, projection radiography, computed tomography, magnetic resonance imaging and sonography. This article presents the relevant studies subdivided by modalities and discusses the respective applicability in age estimation practice.