Contrary to what many fans believed after the prequel trilogy, stormtroopers arenotclone troopers. The clone soldiers that were created on Kamino aged more quickly than other humans and died prematurely, and so, the clone troopers had been replaced by Imperial stormtroopers, who were recruited and trained at Imperial Academies.
The clone troopers were inRevenge of the Sithand executed their primary mission, Order 66, but not long after, they began to be replaced. The television showStar Wars: Rebelsconfirms that the clone troopers were phased out beforeA New Hope. Many stormtroopers receive training for their role from the time that they were children.