This a bit of a late reply, but you're never too old for Manic Panic
. I keep saying that I am going to dye part of my hair pink again (Manic Panic color Red Passion), but I'm slightly afraid of what my colleagues will think.
I used to semi-perm dye my hair for several years before I wore it curly. After I went CG though, my scalp wasn't happy with dye. Now I'm thinking of giving it another go because I want to cover a few pesky white hairs (I'm only 23, I want to look like it).