One consideration is if/when he is due for a growth spirt. My grandson will be 14 in January and has grown 7 inches in the last year. Fortunately for his dad, he is fully into lacrosse and doesn’t need sport specific gear to use. Sure, shoes, etc.

At his club head speeds and distances, he is likely ready to go to an actual “adult” fitting. It doesn’t sound like shortened junior clubs will fit his game. The only question is if he would need a whole new bag in 2 years due to growth. Courses that offer excellent junior programs and also support Titleist equipment should be good starting places.