Hello.. As seen in picture your gap could be because of fibrous tissue in between your teeth called as frenum which is attach to the upper lip. We can just relocate this frenum a little higher than its position right now and then close your gap by braces. Since you said you are 27years assuming your bone condition is good you can go ahead with Orthodontic treatment with frenectomy. It is a very easy procedure so dont worry and go ahead with it.