If the Ranger has been recently serviced, I would have no issues diving a 5 year old Ranger. It's a rugged BCD and it really hasn't changed significantly in the past 5 years. The one thing that newer Rangers have that people seem to like are the trim pockets. Certain model years had them.
As for value of a Ranger, I've seen it go from $250 to $450, depending on size and condition. eBay is a good gauge, as well as ScubaBoard's own classifieds section.
When checking out the BCD, check inflator, dump, and look at the internal bladder. Those are the wear items. With only 35 dives, these components should be in great condition. As for serviceable life, it depends on how much you dive and how well you take care of your gear. It should last you years of diving or hundreds of dives. It's a well made BCD.