the thing is i think it was revealed in vivre card or sumn about her df name and its abilities. That also what set her aside with Bonney's ability which able to inpact living things.
That's all she used it on, we don't have any confirmation it ONLY works on that tho.

But still, if she could, they should've just made her turn Kaido into an old man when he was drunk.
wiki is not 100% reliable but they keep up with every OP content they said its only impacting inanimate objects... well not that it matters when Oda decide to show it can impact living beings as well:kayneshrug: but that makes her df very similar to Bonney's df minus the ability to make people younger.