My DD is 14 Years old and people have told me to my face that I lie about my daughters pitching speed. Honestly I don't care, I know what my kid pitches and have clocked her with a ball coach Radar. I hear them are pretty accurate. But you should see some of the faces I get when I tell people she is throwing 54 at 14 years old. It's almost comical. I don't care if she throws 45 or 75...if she is getting outs then I am happy.
In So Cal 14U TB, 54 is generally considered "decent", but not exceptional. 54 with good control and a reliable change-up will be effective against most teams. Best pitcher we saw this year was topping out at 58-59 with very good control on 3 pitches. She destroyed us...twice. Fastest pitcher we saw was 60-61, but all she had was speed. She came in as a reliever in a close game. We hit her hard and won the game.