It reinforces that the rapes are done for the terror factor of victims beyond those that are raped and not because the soldiers are horny or whatever other stupid excuse.

I think almost any crime against the elderly or children is generally viewed as worse, with good reason. They're generally more helpless and less able to fight back/run away.

I also find that odd. It makes it almost seem as if raping elderly women is something that requires extra mention. So that nobody assumes that we are talking about the "normal", "understandable" rape of younger women. It's seriously fucked up.