- 皓首穷经 hàoshǒuqióngjīng to study until old ageTo devote one's entire life to the study of classic texts; used to describe an aged scholar who remains dedicated to learning.
- 皓首苍颜 hàoshǒucāngyán hoary-headed and old-looking(idiom) white hair and a gray, aged face; used to describe the appearance of a person in old age