I saw my first grey at 15, my mother was 100% silver by the time she was 40. I waited til I was nearly 30 and then couldn't put it off any longer. I'm 35 and spent the first few years getting my hair done by an amazing colorist friend of mine. I haven't been able to afford him since Clara was born, so I just rely on box color, which I have to apply every 3-4 weeks, because my greys are really resistant!