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the prime of one's life
01
самое успешное время
a time in one's life when one is in the peak of one's physical condittion
02
расцвет жизни
a period in one's life that brings one great happiness or success
Пример
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.
