30, had a white gold band but currently wearing a black silicone one. Had to have the old one cut off a few months ago and haven't gotten around to replacing it, though I'll likely just get another white gold band. Honestly I kind of like the silicone band, I know it's an extremely rare occurrence but not having to worry about ring avulsion is nice.
I think gold bands look nice but for whatever reason I associate them with older men and women. I'd like to get one at some point, but I'd be comfortable wearing one around 40 or 50.