Starvation would hit other demographic first and harder. The very young and very old would be heavily represented instead. If you're gonna kill people for food teenagers will be the last people you'll kill due to resources invested in them ant potential future yields. You're gonna kill 5yos or something.
I think you are making a ton of assumptions about the hypothetical starvation event. First, if you are killing people for food, you are going to take what you can get. This might be the neighboring tribe of all ages, as described in the article.
