We have a 26 year age difference and She is from Ukraine, I have never been more in love! We already feel punished due to age gap because everyone else around us has gotten there initial approval and we are still waiting. Thank you all for your supporting messages, they really do help!
My now husband and I have a 28-year age gap. I did a lot of research on overcoming age gaps in the US immigration process here on this site and followed it closely. We chose the CR-1 spousal visa route and he was approved 11 months after I filed an I-130 petition. Many have done it for K-1 too. All you have to do is submit evidence that the relationship is real. For France, you should be okay with basic evidence since it isn't a high-fraud country. Good luck!