obstinacy of old age; stubbornness in old people
Refers to the inflexible, stubborn attitude often associated with elderly people. Used as a set phrase.
My grandfather, with the obstinacy of old age, refuses to use a new smartphone.
老いの一徹というが、父は自分の意見を絶対に曲げない。
They say old people are stubborn, and my father absolutely won't change his opinion.