I was 25when I had the surgery so close to your age. They tend to underestimate the correction so that u don't get your hopes up. I had anterior posterior but not loosening and got brilliant correction. It is dependant on alot of factors.
Its a serious surgery especially for an adult. Without sugar coating the recovery is rough. I tried to go back to work around 4weeks. I still struggle quite abit though. It varies from case to case. There are people on here that really can do amazing things after the surgery.
Hope it all goes well for u