I think it should be a decision in terms of your confidence. If you feel like you'd feel more confident hiding your greys, go for it.
I don't think anyone (except from the odd exception) would really care about whether you're grey-haired or not. If you're age isn't a problem to them, I can't imagine grey hair would suddenly make them lose interest, and likewise if a person felt you were too old for them, I don't think dying it would change their opinion. Not saying you're old or anything like that, I just mean that I don't think a bit of grey hair would make you seem any older than you are.
I'll admit that it seems a little early to be going grey, but I guess we all go grey at different times, I don't think it'd change anyone's opinion of you, unless they were particularly shallow.
So in summation, I don't think you
should dye your hair, in the sense that I don't think you should feel pressured to, but if you think it's right for you, that's all that really matters