Do I have to mind about our age gap?

My fiancee is 25 years old, half of my age. I met her on one of the foreign matchmake tours I'm involved with. I love her and what's bothering me is our age gap. It's the people around us which made a huge impact in my certainty to get married to her. They have always something to say about it. Do I have to mind about our age gap? I need your advice! Please...