Make and model specifics aside, condition and treatment of the vehicle outweigh mileage.
I bought my current car, driven 100 miles round trip for work every day, about 2 1/2 years ago - with 99k miles on it, and it reached 149k miles today. Aside from modifications for the fun of it, I've only done oil changes, filter, spark plugs, brake pads, rotors... the simple maintenance items (and one recall). However, before I bought it, I pulled the history report on it, verified it only had 2 owners, all service was done on time (or ahead of schedule), etc.
If you know somebody who is good with motorcycles, take them with you to evaluate the condition. Only thing I can think of is that the "dent in gas tank" may be from it being either knocked over or someone fell off of it while riding ("dropped" in motorcycle speak, I think). The picture looks great for a bike that is 30 years old, but if it doesn't run well or has major mechanical problems.........
(I had an 85 or 86 Honda VFR700 about 20 years ago but never got past learner's permit, and the engine seized while in storage)