I purchased a "new" bike from my local bike shop that is five years old--should they have disclosed this? The bicycle is a Moots Mooto X RSL.

I bought the bike in June 2017 and just learned when I registered the frame that it was manufactured in 2012.

The tag on the bike showed that the price as offered was about 30% less than the original price. Big discounts for last-years stock are common. Such a discount is usually less than 30%.

Typically Moots are made-to-order, but through a dealer network; this bike was offered for sale as a complete bike though I suppose it is not uncommon--i.e., someone orders, pays the deposit, but does not return to take delivery.

Last week, when I registered the frame with Moots, I learned that the frame was manufactured in 2012 (and assembled and shipped to the LBS in that year).

The components--which might be original, I don't know--are about the same age; for instance, the particular XTR component set was discontinued in 2013.

I purchased this as a new bike (I don't think this LBS sells used bikes in fact); I don't know for a fact that this bike is used, but the fact is that it was five years old when I bought it.

So for instance the resale value of a 2012 model versus a 2017 is substantial.

Should the LBS have disclosed the fact that this bike was a 2012 model--given that I bought it in 2017 from a shop that only sells "new" bikes?
If it's actually used, as in previously owned with real mileage, they should have disclosed that. If it's in new condition, or new condition with some amount of the discount being for shop wear or due to being a low-mileage return, then I would say there's nothing disingenuous about omitting the manufacture date unless asked directly.

For better or for worse, it's not the standard practice in bike shops to include the model year on the sticker, as is seen for example on a car lot. Maybe it's a reasonable question whether that makes the whole industry that much scummier, but following the practice doesn't make any particular shop especially scummy.

Many who work at or run shops don't have great feelings about the industry's general insistence on model year cycles. The way it tends to play out is the model year cycle is one of the back industry's tools to generate sales based on perceived obsolescence, whereas we in shops know if a bike was good and worth standing behind 5 years ago, it very probably still is today. Meanwhile, however, the model year cycle creates a need in the retail environment to constantly worry about selling through stock before it becomes last year's model, an artificial panic which really doesn't do the retailer any good in the end. This is only to give some background about common attitudes in shops on the topic.