noun
declining years; old age
A literary, somewhat poetic term for the later years of life, often with a nuance of physical or mental decline. Rare in everyday speech; more common equivalents include 晩年 (ばんねん) or 老齢 (ろうれい).
彼は頽齢に達してもなお創作意欲を失わなかった。
Even in his declining years, he never lost his creative drive.