personally i trained 4 3 and a half years, but professionals train for minimum 8-9 years as i know...
About 16 years
it depends on how much time and effort you are willing to give. you have to practice hard and eventually you will become better and better at it.
pro like Olympics is about starting at 4 and making it at 16 and thaats for females and we train about 3 hours a day 7 days a week year round its tough
Well da Evgeni Plushenko