Beer has no set expiration. I've 2 year old porter that's wonderful, and I've had light beers go 'funny' in under 3 months.
I've not made cider, but have made apfelwein, and it definitely should age 6 months before it begins to show off its true flavor.
I'd say hard cider or lemonade, if stored properly, would be good at least 1 year in the bottle.
Hell I have 11 year old mead that was never sorbated or sulfited, and wasn't stored the best, and its still amazing.