Congrats on the find. My Unisaws are 63 and 71 years old. Age doesn't hurt them. Use may actually be a little better than dis-use, but it should be fine. Price should reflect the slight risk and only you know what that means to you. If the top is rusted, clean it gently with fine scotch brite pads and something like WD-40. DO NOT SAND the top, you can ruin the flatness which is part of the beauty of that saw. Good luck!