premise: A man with salt and pepper hair, in a quasi crew cut style, wearing a black tank top is just ahead of a group of people behind him on a sidewalk or street. hypothesis: A person with salt and pepper hair, wearing a black tank top is just ahead of a group of people on a sidewalk or street.
neutral: a person could be a man or a woman- although in this case, it can be inferred that the man is indeed a person. So this sentence is correctly inferred to me.