About 800 years.
He says this in either Return of the Jedi or the Empire strikes back.
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In episode IV A New Hope, Ben (Obi-Wan) Kenobi trains him for a short time. After he dies, His spirit tells him to go find Yoda. Yoda trains him as well. Between the movies IV and V, He trains himself.
No one knows where Yoda is from just yet. His homeworld has not yet been revealed
Frank Oz who did the voice of yoda was also yoda's pupeteer
bontu sitmus was a jedi legend he trained yoda and beat 7 dark lords
Anakin was the oldest young ling because he joined the JEDI when he was eight years old. Anakin didn't know how old he was a few years before so when some one asked how old he was he said three!