I am 60 and my red hair is loosing its colour with some grey coming through. I buy cheap Henna powder at the Trade Aid shop and make a paste with a heaped table spoon. I wash my hair normally and use the paste as a conditioner. I leave it in for a few minutes and rinse out. My red hair restored! Looks natural, and is good for the hair and the environment. A NZ$6 bag lasts a whole year. I usually do this after a hair cut so every 6 weeks. There is also black Henna for those with a different colour at some Chinese markets.