I am 53, and have been pretty much silver since I was 30 and never choose to color it. So I never had to transition which I have heard is hard. There is a great website that might help: goinggraylookinggreat.com.
Go for it;]
Cut and style are EVERYTHING, the difference between old and hip.
If I had a nickle for everyone who has said...."If my hair was the color of yours, I would let it go too," How do you know until you try? All the best;]