I've got a cockerel hatched end of last April, or thereabouts, and he's already a dad. Shouldn't be a problem as long as you see him making the effort to mate.
I'm trying to establish my main rooster's genetics in the flock:
Top left is him, top right him plus my hatchery quality Buff Orpington hens. Bottom left is his son and bottom right is one of his two daughters after crossing with the Orpington ladies...
This year's plan is to cross his...