1995 Mazda 929 Gasket Oil Leak

I recently bought a 1995 Mazda 929. I took it to a near by Firestone for a complete vehicle inspection. They said, The Gasket Oil is leaking. They actually shown me the leak, its not dropping anything but its becoming wet and I can see the oil is leaking somewhere on the upper Gasket. They recommended to replace the Gasket to fix the leakage. I need your suggestion if it is a major issue that needs to be fixed immediately or Is it normal in used cars of that old, so I can wait until I see the leakage drops on the floor. Please advise.