Has anyone rejuvenated with some grey hair?

[obey_evolution]

What should one expect if training with "Become an 18 year old" with a little grey hair? Should existing grey hair return to colour or does the grey hair fall out or what? Would there be any difference if a male uses "Become an 18 year old girl" (as ones hair would change to be thicker and longer according to the file).
Thanks
P.S. Sure I can dye it, but this should be an early sign it is working, right?

[Endo]

I typically warn against expecting any physical changes from files or other hypnosis. There are stories, sure, but they are few and far between. Especially at this time in your life, when your body starts to degrade notably, and your cells' abilities to regenerate and change has started to slow down.