The Outer Limits - Original

I am trying to find an episode that I saw years ago, but I only remember this one scene: a couple of teenagers (a boy and girl, I think) sitting on the grass under a tree—I realize that's pretty vague, but that's the main thing I remember. It might have been some "garden of youth" kind of place, or the young man was from the past or the future (there might have been something about a time warp?), or he was the devil, or... (sorry to be so fuzzy on those details—I remember my tv reception kept cutting out and I wasn't able to watch the entire thing). It sounds like "The Guests," but I don't think it was that episode. It may have been the Twilight Zone or some other show, but I am pretty sure it was the Outer Limits. Can anyone help me figure out what this was from? Thanks!