BERLIN — A 94-year-old man who served as a guard in Hitler’s SS clutched his cane as a bailiff wheeled him into a courtroom on Tuesday for the start of his trial on charges of assisting in the murder of hundreds of the 60,000 people who perished at the Stutthof concentration camp.

Johann Rehbogen was still a teenager when he began work as a guard at the camp, where he was stationed between June 1942 and September 1944. Because he was under the age of 21 at the time the alleged crimes were committed, the case is being tried before a juvenile court, where the maximum sentence he could face is 10 years in prison.

The indictment lists the deaths of more than 100 Polish prisoners and at least 77 Soviet P.O.W.s, as well as “an unknown number — at least several hundred — Jewish prisoners” killed in the gas chambers or by other means during his tenure at Stutthof, located on the Baltic Sea coast near what is now the city of Gdansk in Poland.

More than 140 mostly Jewish women and children were killed by injection of gas or phenol “straight to the heart of the individual prisoner,” while “an unknown number of prisoners died by various methods, including freezing in winter 1943-44,” according to the indictment.