Here's a breakdown of key moments and his age:
* Age 9: Anakin is discovered as a slave on Tatooine, a powerful Force-user with the potential to be a powerful Jedi.
* Age 10: Anakin is freed and trained as a Jedi Padawan by Obi-Wan Kenobi.
* Age 19: Anakin has nightmares about his mother's death and feels a growing sense of powerlessness and fear. He starts to have dark thoughts and urges.
* Age 22: Anakin is haunted by visions of Padmé Amidala's death, and his fear and anger intensify. He becomes obsessed with finding a way to save her.
* Age 24: He secretly marries Padmé and succumbs to the temptations of Palpatine, who promises to teach him how to save her from death.
* Age 24: After betraying his friends and the Jedi Order, he kills younglings and other Jedi, becoming Darth Vader.
Therefore, Anakin's transformation can be considered a gradual process that begins around age 19, culminating in his fall to the dark side at age 24. It's important to note that while some may call him "evil" after this transformation, he is ultimately driven by fear, love, and a desperate desire to protect those he cares for.