Really 27 is not that old surely! Especially with 6 years experience. You'd assume 99% of boxers start at ten and finish at 18 sometimes with the way people worry. At least where I'm from they are the extreme minority. If you can still spar at a good intensity and keep your coach happy your age is the last thing that should stop you. In something like women's gymnastics - you hit puberty and you're done for and I can understand it but not with a sport that requires strength, mental maturity and skills that you've already previously developed for 6 years!