Just bought one with similar miles - I am not worried.
My wife's bike has almost 30K on it - running like a top.
Dead simple motors, easy to wrench. keep up with the valves and belts and you are good!
Rear suspension might need to be taken apart and greased and/or the bearings replaced.
If you haven't found it already www.elefantadventurebikes.com
and check out the google group for the same. Also - Facebook Cagiva Elefant group - all excellent sources.