The stage of Erikson's Psychosocial Development theory that describes individuals who are volunteering in a community free health clinic is likely Generativity vs. Stagnation.
This stage typically occurs during middle adulthood (approximately ages 40 to 65) and involves individuals striving to create or nurture things that will outlast them, often by guiding the next generation. Volunteering in a community health clinic reflects a desire to contribute positively to society and show concern for the well-being of others, which aligns with the concept of generativity.