I. Introduction
Living age inference plays an important role in forensic science related case studies, especially in adolescence and early adulthood. One of the signs of having the capacity for criminal responsibility or civil conduct is that the individual is required to reach a certain age. The age in the laws of all countries refers to the time age starting from the time of birth. As one of the biological age evaluation indicators, skeletal age can more accurately reflect the time age of people. In practice, if the age is suspicious or there is no relevant evidence to prove the age, the accurate and reliable inference result of the living age can be used as scientific evidence for the investigation and trial of criminal cases and social welfare security. With the development of medical imaging and post-processing technology, imaging technology has gradually been used to estimate the age of the living body. The examination of left wrist X -ray, physical examination, oral curved section, dental examination, and thin-layer CT of clavicle sternum end are listed as the routine identification contents of living body age inference. X-ray examination and CT examination techniques are widely used in the estimation of age in vivo, and the relevant methods are relatively mature. MRI, ultrasound and other imaging techniques are also gradually applied to age estimation. Stay https://pubmed.ncbi.nlm.nih.gov/ and https://www.cnki.net/.the database is used to search the literature. The keywords are age estimation, living, X -ray film or ultrasonic or MRI or CT. The literature in the last ten years is selected, and the literature in the last five years is preferred as the reference of this article.