Has anyone here had any experience with restoring old, old wide plank oak flooring?

The house we’re moving into was built in 1860. The floors under the carpet are old, wide plank wood, probably oak. We have the same kind of floor in our current house, which was built in 1910.

I took the carpet out of one room upstairs in our house and just painted the floor. (One room of the house we’re wanting to buy is done that same way. That’s how I know the flooring is the same.) The lady who owns the house we’re trying to buy said that she’d heard that those old floors can be beautiful if they’re restored.

I’m dubious. There are gaps between the boards and…well, it looks about like this, only the boards are about two widths of each board shown in that picture.

What say ye experts in all things real and imagined?