weakened, declined, died down
年を取って彼女は記憶力が衰えた。
As she got older, her memory deteriorated.
年をとるにつれて、私の健康状態は衰えた。
As I got older, my health deteriorated.
私は体力が衰えた。
My stamina has declined.
風がやや衰えた。
The wind has eased somewhat.
彼は健康が衰えた。
His health declined.