From Kanzenshuu Dragon Ball Wiki
|Some time in
|Videl is born.|
|Some time in
May [note 2] 757,[note 3]
|Son Gohan is born.|
- Dragon Ball Z Episode 171 (Flashback)
- On page 100 of 1996's Dragon Ball Daizenshuu 7: Dragon Ball Large Encyclopedia, Videl's birth year is listed as Age 756 in her entry within the "Human Racial Dictionary" section. However, 2009's Super Exciting Guide: Character Volume revises her birth year to Age 757, the same birth year as Son Gohan, a date which is upheld and reinforced by 2013's Dragon Ball Chōzenshū 4: Dragon Ball Super Encyclopedia.
- Chi-Chi celebrates Gohan's birthday in Dragon Ball Z episode 171, which takes place in May, days before the Cell Games. Gohan says that the day of the celebration is not actually his birthday, and that his 11th birthday passed some time while he was in the Room of Spirit and Time between 16 and 17 May 767. The opening narration of Dragon Ball chapter 421 establishes Gohan's age in April 774 as 16 years old (which seems to not account for his time in the Room of Spirit and Time), placing his birthday as some time after April. The timeline within Dragon Ball Daizenshuu 7: Dragon Ball Large Encyclopedia and Dragon Ball Chōzenshū 4: Dragon Ball Super Encyclopedia suggest his birth month as just May.
- In the original Weekly Shōnen Jump 1988 No. 46 issue's serialization of chapter 196, Gohan states that he is three years old. The title page of the very next chapter gives his age as "four years old", and his age in chapter 196 was changed to match in the 17th tankōbon in May of the following year. With the setting already established as "five years" after Goku's reunion with Chi-Chi at the Tenka'ichi Budōkai, Gohan could not be made much older than he already was; nevertheless, he was made as old as was biologically possible, which is four. All official Japanese adaptations and publications, including the television series, follow this change.
- Doru Money celebrates his 10th birthday in Age 767; the Tenka'ichi Dai Budōkai was created as a present so that he could watch Mister Satan perform.
- "Heroes Collection 17 – Videl". Dragon Ball Super Exciting Guide: Character Volume. Japan: Shueisha, 03 April 2009. ISBN 4-08-874804-7. (p. 31)
"Human Racial Dictionary". Dragon Ball Chōzenshū 4: Dragon Ball Super Encyclopedia. Japan: Shueisha, 09 May 2013. ISBN 978-4-08-782499-5. (p. 108)
- "Chronological Table of DB World". Dragon Ball Chōzenshū 4: Dragon Ball Super Encyclopedia. Japan: Shueisha, 09 May 2013. ISBN 978-4-08-782499-5. (p. 17)
- Dragon Ball Z: The Galaxy at the Brink!! The Super Incredible Guy. Japan: 1993 Toei Anime Fair (Summer). 10 July 1993.