You will not be denied because of an age difference, but because it is a characteristic common in fraud marriages, they do take a closer look at the relationship. BUT it is only one factor, there are so many other characteristics of fraud/legitimate relationships, it tis the whole picture you present.
Pic are not always enough because fraud couples can also take pictures. Gather your evidence and organize it to put together a complete image of the relationship. How the interview is handled also weighs in.
In short do not worry so much about the red flags and focus on how to show what you truly are- a legitimate couple. The consualte officers do not know you and can only measure your legitimacy based on the evidence in front of them
Good luck