pollen?

Yes, the oldest pistils start turning brown quite early in some strains and is not necessarily a sign of pollination. If pollinated, all the pistils turn brown at the same time, - that is, all the pistils in the same area that were pollinated at the same time. If it is just the isolated pistil like in your pictures, I doubt any pollination has occurred. Hope this helps, Organoman.

Not necessarily pollen, more likely something else. Wouldn’t sweat it. It’ll be obvious in 2 weeks or so when the bracts show seeds

Hairs naturally turn orange/brown overtime.