If you're just making a 1L starter I'd either use the older, but still viable one and save the fresh one, or just use the fresh one and toss the other two. You won't gain anything by pitching more packs into a 1L starter.
As far as the past date one goes, if you're really frugal you can try to save it by making a starter with it, letting the trub start to settle, then decanting the liquid portion only into a new starter. It's not a surefire method, but I've used it with some success for things like limited release strains that I forgot about and can't get any more.
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