I began going grey in my early 30s. It became quite noticeable in my mid 30s. Today it's undeniable. I have often said I would never dye my hair. I have a number of good friends who are 10-15 years older than I am and who all dye their hair. They have been trying to persuade me for a very long time to start dyeing. I tell them dye is for garments, not hair. A couple of years ago they threatened to kidnap me, get me drunk, and dye my hair when I passed out. I told them their plan was doomed to failure since they tipped their hand but if they somehow managed to succeed I'd shave my head the very next day.
I happen to like my grey hair. I am comfortable with it even if it makes me look older because everyone else my age dyes theirs so they look younger. I like my stripe best. I like the way is swoops over one eye on a good hair day. It's fun. It's got personality. Why would I pay someone to take it away?
That said, when one of the friends who threatened me with kidnapping and a coercive dye job asked me to put pink in my hair for the co-conspirator who now has breast cancer, I wouldn't have dreamed of saying no. I made sure they all understood I was not waffling on my original statement. I merely revised it to be more specific. I will not ever dye my hair for the purpose of hiding grey. However, I will very gladly put in a splash of pink to show solidarity and give a morale boost to a friend who needs it.
I'll even give over my favorite stripe to the cause.