Rene Angelil & Celine Dion (26 years)
This couple may be the most controversial on this list, because when Rene Angelil and Celine Dion first met, he was 39 years old and she was 12! Initially, he was her manager, but by the time she was 19, they had tied the knot, leading to intense criticism that he had begun grooming her at an early age. But even in the face of public outcry, Rene and Celine persevered, remaining together for over thirty years until his passing for cancer in 2016 at the age of 73.