Off course there is no specific moment when a coach or parent will say it is time now to throw curving ball. However, the proper age for the player to be able to throw curving ball is 14 or 15 years old. If young players throw curveballs on a consistent basis at younger ages they can cause damage to their elbows and thus hinder the growth process
There are several key elements to the curveball that must be followed in order to throw the pitch properly
1- Grip the ball with your middle and index fingers together, with the fingers across the seams of the ball at the widest part
2- Donít let the ball touch the palm of your hand, or you wonít generate enough topspin, which is what allows the ball to drop when it gets close to home plate.
3- Practice developing your speed as you master your form and stance. Speed is a very important factor in your delivery. Curveballs with little speed are easily hit by the batter
4- It is important that you release the ball close to your body (Short Arm). The further you release from your body, the less resistance your middle finger will have on the seam and therefore your rotation will be looser.