in dbz the first hes about 20 later on in gt 50 technically and dbz over 100
depends on how old goku is
i believe that he's around kid goku's age which is 13
goku never died he went into training with shenron ,the dragon from the dragonballs.
I think he is about 12 years old
29
The old man who took care of Goku when he arrived on Earth is named Grandpa Gohan. He found Goku as a baby and raised him in the mountains until Goku accidentally caused his death. Grandpa Gohan played a significant role in Goku's early life and development.
He is 11 years old.
18
He never dies
Goku first achieved Super Saiyan Blue in the "Resurrection 'F'" saga, when he was around 40 years old.
About 49
episode 235