A Fish's Memory Is Seven Seconds, My Life Is Seven Years

It is said that the memory of a fish is only seven seconds, so maybe I was born under a fish. My life is only seven years. After every seven years, I am reborn into another person or thing, man or woman, animal or plant. I will own her/his/its body and her/his/its memory. Once I enter her/his/its body, her/his/its life will enter the countdown to the last seven years. I died very young but have always lived. Life is something I seem to have had many times but never really had.