My RV is almost as old. Have no fears about using it for many more years. But I keep it well maintained. Finding one that has been well maintained can be a problem.
I see all kinds of post here from people that have purchased 80's and 90's MH's with minor problems. But overall lots of enjoyment in them. Others have purchased similar models that were not properly maintained. They are spending time and money to just get things to run instead of enjoying MH.
Read some of the threads about buying a used RV. Here is one.
Don't Buy and Old Motorhome Unless...