the prime of one's life
01
a time in one's life when one is in the peak of one's physical condittion
例
At the age of 75, the singer is not exactly in the prime of his life!
It's many a man and woman who, in old age, looks back on the prime of their lives with bittersweet nostalgia.
02
a period in one's life that brings one great happiness or success
例
My father was in the prime of life when he was diagnosed with cancer.
