Oh I know this, believe me. And some places do offer EMT cadet placements to under 18s, unfortunately not in the city of Boston.
Can you help me think of any other opportunities that are considered as prestigious as lab research with a professor? I don’t want to turn my son off to his health care ambitions, but he is decidedly not interested in research, and I don’t know many other avenues for activities on that level. You don’t get a “first author” for CPR certification after all.