33 Years old when the Androids arrive.
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The same as in Dragon ball z because it is more or less the same show.
It stands for all the Kais in the universe( OLd Kai, King Kai, Supreme Kai, etc.)or also it may stand for The Kai In Kaioken kaioken is nothing but the ellaboration of the word the power of the kais n dbz kai kai means dat......... even i dunno!
in saiyan saga 23 in namek saga 24Goku was 47 when Dragonball Z ended.
About 49
it never said.