There's an incredibly talented kid at our club who just turned 14, and he was recently clocked at 105 kph. (65 mph for you British). That was on a bad day for him, when he was coming back from a broken arm. We think, at full fitness, he hit 120 kph. Not only is he lightning quick, but he can swing the ball prodigiously, both ways, when he wants to. He has the full array of fast bowling skills. He can bounce you, he can swing the ball, he can cut the ball, he can do everything.
He's also incredibly accurate. We gave him a challenge, to hit a 20 cent piece for 6 balls straight, at full pace. We had a batsman stand up the other end to verify the pace of the ball. He hit the 20 cent piece every time. We tried it again. He hit the 20 cent piece every time. There might have been a bit of luck involved, but you don't hit a 20 cent piece 12 times straight at 65+ mph without a bit of skill.
He can bat, too. And he can keep. He's also got the cricketing smarts to go along with all that talent. We think he's going to end up in Test cricket, or get seriously close.
He says his secret is to have a good technique.