I'm 58, and did a thread not that long ago about this subject.
I had my first grey hairs in my early twenties (father was totally silver grey by 30).
My natural colour was red/brown, my hair grows really fast, so on top of the problem with red colours fading, I was getting grey roots very quickly after colouring.
The 4 hour session in the salon when I decided to have the colour stripped has been covered on here!
Now grey, but playing around with temporary fun colours (currently pastel pink, have pale purple already lined up) also documented on here!