Kayana Szymczak for the Boston Globe

For years, Jonathan Bloch has been the Drowned Hogs’ top fund-raiser for Wellspring, bringing in thousands of dollars to the Hull-based nonprofit social service agency in its annual dash-into-the-frigid-ocean-for-cash event — and he’s still not old enough to vote, buy alcohol, or rent a car.

Bloch, 17, is not the only young person making an impact beyond his years. He’s one of many young volunteers in the south suburbs who are dedicating time and energy to community service.