You have a real wood floor. 44 years is a young floor. I live in a home that is close to 150 years old. I believe everyone else is talking about engineered wood floors. Not the same thing. Your floor is real wood with several coats of polyurathane that you can refinish (sand and put down more polyurathane). The engineered floor has a guaranteed finish. What people don't realize is the finish is the color of the engineered wood and not the shine. Each piece of wood is separate so mosture can get under that piece and damage the floor, usually warping. A real wood floor that has coats of poly on it - the mosture can't get under the individual planks.
You can clean a real wood floor with anything and will not damage that shine. If you do - you just scratch it up and put on another coat of poly.
Janis