>>183923626>Which is another retcon
Goku had slow aging as a child. It's why everyone didn't recognize him when he came back as an 18 year old who had grown 2 ft since he was 15.
Then toriyama decided to make it an official thing at the end of the original manga.
It's not a retcon because a retcon is retroactive, meaning it has to go back to correct something. We just didn't know shit about Saiyans because there was only one who knew anything about them, and he's pretty anti social.
We didn't know about super saiyans until it became a plot point
we didn't know saiyans hair don't change until Vegeta's didn't grow over a year
we didn't know about zenkai until it was explained.
Expanding on a race isn't a retcon
retcon is stuff like the patora having a time limit, since it was previously stated not to