90 year charged for Nazi crimes

What do you do when you get a 90 year who has committed horrendous crimes many many years ago ? These people have not been found till now, and only now is the criminal located, and the person is 90 years old. However, the crimes committed by the Nazis were at all levels, with people indulging in mass killings, others doing smaller number of killings, and yet others involved in facilitating the crimes (and being equally guilty). These killings have been ruled to be genocide in the past, and have always been prosecuted to the fullest extent possible. And even among the murderers, the SS was the one who were the most guilty, and who deserved the maximum punishment (link to article):

A 90-year-old man from northern Germany has been charged with 58 counts of murder for the killings of Jewish forced laborers in the final days of World War Two. The man, who was not named, was a member of the feared SS serving in what is now Austria when he allegedly carried out the crimes, the state court in Duisburg, western Germany, said Tuesday. A state office responsible for the prosecution of Nazi war crimes filed the charges.
That day or the next, the court said, the man made other Jewish forced laborers who were "exhausted and no longer able to walk" to march near the town of Jabing, which was then in Germany and is now part of modern-day Austria. He then "insidiously" shot them from the back, it added.