The newer models have a DPF (Diesel Particulate Filter) that uses additional fuel to burn up accumulated soot in the exhaust, and use DEF (Diesel Exhaust Fluid) that you have to refill periodically. This also decreases mpg, so pre-emissions engines are preferable (IMO).
If it looks good and everything works and is in good shape, I wouldn't be afraid of it.
I have an 05 model that most people think it's much newer. It has all the bells and whistles I want and suits me fine at half the price of a new one.
60k is minimal for a diesel engine and the coach will probably fall apart before you wear the engine out.
But any maintenance is usually big bucks on a diesel pusher, so you have to accept that you may end up spending some money on it.
If well taken care of, it should have lots of life left.
As said above, it probably has the old CRT tube TV's in it that can easily be updated to a nice flat screen.
2005 Newmar Dutch Star 4024 DP 370 Cummins
Towing my 2012 Malibu w/Blue Ox towbar & Patriot brake system