In dendrochronology, the precise determination of the felling years of historical woods is made possible through the analysis of annual rings. Dendrochronology traces its origins back to Douglass (Arizona, 1908). Prof. Huber has adapted this field of research for European tree species and has further developed it. Since the 1930s, work has been carried out in this area in Tharandt. The research in dendrochronology and wood anatomy reveals the connection between climatic influences and the wood structure of trees (annual rings, density, and texture). The analysis of annual rings not only enables the determination of the age of wood samples but also forms the basis for insights into climate reconstruction and climate growth analyses. Dr. Björn Günther is also involved in age determination of wooden samples. His clients are both private individuals and public institutions, particularly in the fields of construction, monument preservation, and restoration. Samples range from assessments of construction wood renovation to determining the age of wood in musical instruments, and even extend to art-historical objects such as carved altars and picture panels. The dating certainty is always as good as the accuracy of the existing standard chronologies, so there can be no 100% dating certainty. Nevertheless, Dr. Günther can date about 75% of the submitted wood samples. These should have at least 50 annual rings for a reliable dating. The samples mainly come from the regions of Saxony, Thuringia, Brandenburg, and Franconia, as Dr. Günther must be on-site for the removal of a sample or the digital determination. Nationwide, in addition to laboratories at universities and other public institutions such as state offices, there are also various independent laboratories specializing in the age determination of historical woods. However, their numbers have been dwindling in recent years. In addition to unfavorable structural developments, financial aspects also play a role in this.