I've never seen a rooster that didn't have spurs, but I'm not going to say it isn't possible (I have a hen who has spurs!). In my experience they start growing little nubs when they're around 4-6 months old, but they aren't fully formed until they're maybe a year and half old. Hope this helps.
Every rooster I've ever met has had spurs. That being said, the one and only Silkie roo I owned had squared spurs. Like the sharp end was blunt. I'm not sure if that's typical for the breed or not (and he never used those funky spurs on anyone, he was more content to be carried around like a baby
). Id say most roos get their spurs at a year or so old, maybe less for faster developing breeds. But I'm certainly no expert. Good luck!