Ok i'll allow two sentences if you're nice. Three if you David Cage. Winner gets called entitled courtesy of your local equality group*
Old troubled man is losing age, getting younger, as he reduces age, he must replay sections of his life to sort his current life out. No second chances, must complete as many sections to fullfill the goal he wishes, and at the end, can see the outcome of his old age after fixing it n all.
*Offer may not apply if you are of coloured descent