Ron, it really depends on the year, model, and the w3ay the previous owner (s) took care of it. I've seen some older ones (late 80's) that look like new. Then I've seen some beat up newer ones too. If you go to look at one, look for stress cracks in the gussets on the deck (everywhere there is a curve or angle). Common on Baja's (mine has many, drives me nuts).
Are you looking at a particular model? Year? Power???