It's really not so bad. It is amazing how much a good sanding accomplishes!

Thanks all. My mother says it’s, and i quote, ‘repulsive’ 😂

Only other reason I was leaning toward new is because I’m very concerned about vermin. there are definitely cracks in the corners and throughout and I need peace of mind that everything will be airtight.

If this is the subfloor/finished floor in one (in other words, there is nothing underneath except the floor joists), and it‘s sound and level, you can lay engineered wood right over it.

Jackie- No floor and trim situation is “airtight” even in brand new homes. There are so many other places for bugs to get in — receptacles, light fixtures, sill plates, etc. — that the floor is not a big issue. Besides, even though you have cracks in the floor, there is a subfloor beneath that. I have concrete floors throughout and we still have all kinds of bugs, ants, and spiders...even in my northern climate.

I hear you. Bugs I can handle. NYC mice not so much 😬

You have a common high traffic low-cost 19th/20th-century flooring of plain sawn, oak tongue and groove, in very short lengths. It likely has another sanding in it, or at least a screen and re-coat. Concerns regarding rodents should be addressed on a case by case basis (look for and block specific points of access), rather than with a new floor.

That said, a wider plank flooring with longer individual pieces would certainly make the place look more upscale. Many floating floor options available these days could accomplish this for you.

Not sure why you have to worry about mice either with a floor installed on a sub-floor. I have occasional mouse problems with my concrete floors so it’s obvious they have many other ways to get in. If you want to change the floors for esthetic reasons, go for it. Just don’t expect that it’s going to prevent vermin.