Frankly speaking, I don't believe plastic surgery will make a girl looks much younger. Plastic surgery will make a girl looks prettier enhancing the various features of her face and the body, I guess.

I agree that it is very difficult to tell a girl's age accurately particularly in the 28 to 33 age range but I am quite confident that with my many years experience with Asian girls, I can tell the girl's age within an error margin of 5 years. Most of the Korean girls in K-shops are below 30 with an exception of a very few.