I am 48 and have short hair. I tried to stop dying my dark brown hair early this year until someone was quite rude and asked me why i stopped - i am too young to go grey she told me. I have done back to dying it again. I would be not quite 50% grey but close. When I was doing it - I had mixed feelings. 1. I didn't want to look "older" than 48 and 2. I didn't want to look older than 48. It does age you. I am not ready to be that comfortable with 48, 49, 50 lol. Maybe when I am 60-ish.
That person was extremely rude and doesn't know what they're talking about. There are plenty of much younger people whose hair has started turning grey so 48 is definitely not "too young to go grey". I think because the majority of women dye their hair, we don't know what it looks like to grey naturally from a younger age. All we tend to see is dyed hair up until 60s+ and then "old people". I will admit when I was younger, I didn't think people started to get grey hair until they got old. I had no idea that it was the norm for women in their 30s to start to grey because I just never saw it.
I'm also not so sure that your position on grey aging you is necessarily true. If you look at that one article someone posted, many of those women look extremely young to me (like look like teens to early 20s) and their hair is lovely. I don't think it has aged them at all.