Dyeing your hair red is not Sunnah.

First of all the Prophet SCW had only a few white/grey hairs so he didn’t need to dye his hair. He told his followers to do the opposite of Jews and dye their hair with henna. The color that it’s supposed to be dyed was never mentioned. There’s Black henna and red henna. The reason behind this dyeing of the hair was during Jihad to look young and virile so your enemies would be intimidated.
So I don’t understand these old Somali men with the big red beards and red hair. That wouldn’t even look right with someone with Arab complexion let alone a black person.