It depends on how you store it.... higher temps = shorter shelf life.
Very true. Cool temps - like in the 50's if you can swing it. Cider is basically a low alcohol wine when you think about it - fermented fruit juice.
Also skunked off flavors in beer come from UV light not age, hence the brown bottles.
skunked flavors in beer come from breakdown of the hops molecules - usually through UV light, but age is a factor because short UV light is ok, long is bad.
Also in the case of the cider (or beer, or wine), the crown cap isn't perfect, meaning over time air will get in. It is however better than a vertically stored corked bottle. The corks dry out and the air really gets in then - which is why corked bottles are kept on their side.
I've not tested with cider, but my experience with wine has found that there is no significant flavor shift in the 1 year time frame. Some of the flavored wines the flavor additive fell off, but no bad flavors came in. In particular my green apple Riesling went from a very strong green apple candy flavor at bottling time to a very mellow hint of flavor at 1+years and I think I found a bottle drink able at 2 years.
Again, cider is like a wine, not a beer. Also, general policy regardless of alcohol type - dark locations, low temps, small temp changes, and no UV if possible.