In my opinion, no, it's not too old, especially for a first-timer. Definitely do your full due diligence, and get a good thorough inspection, but expect the inspector to find a good number of issues (as with a home inspection) -- then you would have to decide which of the issues are worth spending money to fix, and if the purchase makes sense at that point. 47K is nothing, assuming it was used regularly and hasn't sat idle for an extended period of time (47K on a '97 is only an average of a little over 2000 miles per year). Also, the unit you describe is probably no more than a $12 - 15,000 motorhome, so if you bought it and ended up hating it, you surely wouldn't face a huge loss re-selling it as you would on a much newer unit. The only drawback is if you ran into one of those snooty campgrounds that doesn't allow units over 10 years old, but you probably don't want to stay there anyway! Good luck to you!
. . . never confuse education with intelligence, nor motion with progress