How old is Goku?

Goku is 41 years old.

The main character of Dragon Ball, Goku, is a Saiyan who was born as Kakarot on Planet Vegeta.
Goku was sent to Earth to conquer it, but a head injury caused his aggressive Saiyan nature to fade away, changing his destiny. Goku, who is raised in the mountains by Grandfather Gohan, acquires a pure and kind heart that is different from other normal Saiyan characteristics. He must find the Dragon Balls, make lifelong friends, compete in martial arts competitions, and face formidable opponents along the way. Goku greatly values his family and friends after learning of his Saiyan heritage, transforming into Super Saiyan form, and marrying Chi-Chi. His experience continues in Dragon Ball Z and Dragon Ball Super as he receives guidance from mentors such as King Kai and Master Roshi. Goku's legacy is worldwide.