Meanings
of a personaged, very old, especially when decrepit or senile
sein greiser Vaterhis aged father
of hairgrey (also generally implying very old age, not usually of people in their 40s or 50s)
das greise Haupt seines Vatershis father’s grey-haired head
literaryaged; old
Er besucht jede Woche seine greise Großmutter.
Examples
GermanEnglish
Maria erschrak, als sie sah, wie greis Tom geworden war.Mary was shocked when she saw how old Tom had got.