After Hours

70-80 years old.

But I also have storm sets on the outside of most of them, so it's not so drafty. Surprisingly, the house is otherwise fairly well insulated; it will stay comfortably warm inside until outdoor temperatures go below 50°F.

Those are sweet. Hand-crafted by carpenters, out of real wood, wood that's had time to settle before carving.
They don't, really don't make them like that anymore...
House I grew up in? 100 year old windows... could've done with a bit of caretaking... paint off, paint on... otherwise they were just fine.

That you are nothing more than a Windows Cleaner no matter what you get paid to do. See you don't really work in IT because you don't deal with Mac's or Nix only Windows.

Col

Without sash weights, they are inauthentic. Tantamount to a Registry.

Guillotine windows are purely americana to us over here...
We have hinged ones, mostly. The ones where I grew up were a cross shape; four sections to each window; the two lower sections tall, the upper sections square. Cross shaped in total, hinges wallwards, two panes - outer and inner, to each section.