From the full mouth x ray u hv given,u are having bone loss,that's a serious issues which should b taken care of evn if u are not going fr braces,bcz as the doctor told your teeth Wil become loose and fall off n later stage.braces is something which we cn do at any age provided there is good bone support as we move the teeth with pressure through bone.kindly consult a good periodontist as he is the only who cn help n sorting Ur bone loss issue and if he s nodding a yes after bone replacement treatment then u cn go fr braces