I agree with SFool...actually he's no fool...he's wise!
I would get 2 surveys as well no matter how old the boat!!! I have seen a boat showing 300hrs on the motor. And having carefully inspected it realized this was not the case! The gage was new or wasn't working. Engine re-builds are very expensive!!!!
I would also nose around the docks where this boat is located and chat with her neighbours and see what their opinion of the owners are as well as the boat.Most folks like having their opinions asked for.Also with such an old vessel I would want to carefully inspect the rigging
and sails myself.
Do yourself a big favour...ask a friend who you respect for a name of a good surveyor. There are lots out there that aren't thorough and don't give a damn. And NEVER us the owners/brokers surveyor!!!!!
Fair winds, Allan