wrinkles (of old age)
A poetic or literary expression for wrinkles that come with aging, often used in a metaphorical or gentle tone.
祖母の顔に老いの波が刻まれている。
Wrinkles of age are etched on my grandmother's face.
Compound of 老い (oi, 'old age') and 波 (nami, 'wave'), metaphorically likening wrinkles to waves.