piccolo was only three years old when he first fought goku, and only seven years old when he first met gohan .-. EDIT: piccolo was born the same day his dad was killed by goku 3 years pass and goku fights him at budokai tenkaichi which was the last fight in dragon ball. then goku and chichi get married that same day and four-five years later gohan is introduced as a four year old meaning piccolo is 7-8.
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