How old is Goku in Z?

In Dragon Ball Z, Goku's age varies depending on the point in the timeline you are considering. Here's a general breakdown of his age throughout the series:

Early Dragon Ball Z (Saiyan Saga)

• Goku is about 23 years old at the start of Dragon Ball Z. This is based on the fact that he was 12 years old at the end of Dragon Ball and the story of Dragon Ball Z starts roughly 10 years later.

Namek Saga

• By the time Goku travels to Namek, he is in his mid-20s, specifically around 24 to 25 years old.

Frieza Saga

• Goku is still about 25 years old when he faces Frieza, though his body undergoes intense physical strain during the battle.

Android and Cell Sagas

• Goku is around 30 years old during the events of the Android Saga and the Cell Saga.

Majin Buu Saga

• By the time the Majin Buu Saga rolls around, Goku is around 40 years old. At this point, Goku has been through numerous battles, and his age shows as he's now the father of Goten and the mentor of Uub.

So, while Goku's physical appearance may remain youthful due to his Saiyan nature, he is, in fact, aging throughout Dragon Ball Z.