31 and a little bit of grey on on my chin when the stubble grows through and i've noticed 2 or 3 grey hairs on my head, so you should be ok for a few months. I think it's people with very dark hair.

To the best of my knowledge, biotin helps keep hair healthy.
But dunno about grey hair prevention other than hair dye.
I hope a bear throw a book at you, moon at you, and do a tap dance wearing a thong and leather boots.

Is there anything apart from dying your hair to prevent the grey hair coming ? Like supplements ??

Yeah, you should definitely shave.

It looks better on men for some reason I just don’t understand lol

I'm 31 and my beard looks like this.
So I would say prepare for the inevitable.
I hope a bear throw a book at you, moon at you, and do a tap dance wearing a thong and leather boots.