This is always a tough one. Because sound can travel in strange ways and can be hard to pinpoint from inside.
The rear bearings on your car are easy. They are simple old fashioned tapered roller bearings, large inner, small outer, and can be taken apart and easily examined for any pitting in the rollers and/or races, and addressed accordingly.
The fronts are not so simple. They are a dual ball bearing, sealed, and not serviceable. When you swerve to one side, the outer bearing on one side gets loaded more, and the inner bearing on the other side gets loaded more. So the convention of "if the noise increases when I go this way, then the opposite side bearing must be bad" does not really apply. Trust me, been fooled quite a few times.
Whenever possible, I like to lift the car up and (on driven wheels, anyway) run the car at some speed to try and get it to make the noise, and put my stethoscope on the carrier...often I can isolate the offending bearing this way. But it has to be bad enough that it makes at least some noise all the time, not just when swerving.
Oh, and your front bearings should have no play in them. If they do, they are bad.
Honestly, on a car that old, I'd plan on doing both of them if you do one anyway. You'll have all the tools out (they are pressed into the carriers), and they are not all that expensive. Even good ones. Just make sure they get installed properly.
