premise: An elderly man and women walk together past a jewelery store on the sidewalk. hypothesis: An aged couple wander past a jewelry store sticking to the walkway.
entailment: A man plus a woman equals two people total; a group of two people together is called a couple.  Elderly is a synonym of aged.  To walk past something is also known as to wander past it.  A sidewalk is a specific kind of walkway; as they are not described as walking into the store or out into the street, it is reasonable to assume that they are sticking to the sidewalk (taking care not to leave it).