my aunt's son stutters but not to much but i can noticed very well, he is 15 years old and in a few months he will enter high school and I am afraid that it will be more difficult for him, do you think that a speech therapist can help him since he is only 15 years old?

my aunt's son stutters but not to much but i can noticed very well, he is 15 years old and in a few months he will enter high school and I am afraid that it will be more difficult for him, do you think that a speech therapist can help him since he is only 15 years old? I think it's time to tell my aunt to send him to a speech therapist is it likely that he will make improviments faster, since he is young?