David Foster & Katharine McPhee – 34 Years Difference

David Foster is one of the most notable record producers in the music industry while Katharine McPhee is a very talented singer and actress. Foster and McPhee must really believe in the saying “age is nothing but a number” because they have a 34-year age gap. This meant that McPhee wasn’t even born yet when Foster started making money in the music scene. Nonetheless, they seem to be very happy with each other. They have been engaged since 2018 and sources say they will tie the knot in London in summer of 2019.