I read a fanfic once that had a premise similar to this. Vegeta realizes that Bulma will become older and frailer than him much sooner than he will so he goes and gets the Dragon Balls to wish her young again. Everyone else shows up when they realize who it is gathering the balls and Vegeta then says "Make Bulma and Kakarot's mate. the same ages they were when they first met him." Just as Goku starts screaming at Vegeta to stop saying that, the wish is granted. Bulma is back to being 16 but then Vegeta gets floored by a haymaker from Goku, who screams, "BAKA!!! When I first met Chi-Chi she was TWELVE YEARS OLD!!!"
I didn't think there would be this much difference from person to person-I guess even Bulma messes up, hahahahI guess it can't be helped, Goku, we'll go home and have dinner.Chichi I'm hungry.Bulma, the elixir of youth you made is going to get Kakarot arrested as a lolicon.
