Starting kids fly fishing in Fly Fishing Posted January 10, 2019 · Report reply From my experience working with Boy Scouts, I'd have to say, for fly fishing, then need to be 11 or 12 to have the physical coordination to work a fly rod. You should try to take them fishing before that, though. I took my grandson fishing, for the first time, when he was 5. Spinning rod with worms, in a farm pond full of bream. Good introduction to the sport.