How can I repair these 106 year old floors?

[Paul531]

Our floors are gorgeous and we love them unfortunately they're pretty beat up in some areas (see above). How can we best restore these? We have a 4x4 section of unused boards in an attic closet we could possibly use. I've seen other people use rope to go in the gaps. What do you guys recommend?

 

[jcar932]

Rope caulking is great for boats, but I've never really seen it used for floors. If you have something to patch with, you can fix larger damage with the spare boards. Otherwise, you use a filler (or live with the gaps). Either way, you attend to this and renail anything that's loose and reset any popping nails before you resand the floor.