You said the house is 'like 100 years old', what kind of wires are coming into the outlets? if it's the old knob and tube your problem could be anywhere, a splice in a wall, but most likely a broken wire at one of the outlets. If someone has pulled newer wire through, I would still be looking for a bad joint in one of the outlets, but if someone has tied in somewhere in the walls you could be in deep doodoo. I just did a reno where I found loomex tied into knob and tube under drywall, no junction boxes or anything, just bare wires twisted together.
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