There's a particular kind of late fall afternoon, light going gold and low through the windows, when an old table stops being furniture and starts being the whole reason a room works. You notice the wear in the top catching the sun different from everything else around it, and you understand why nobody's rushing to replace it.
I'll say plainly where these fall short, because too many people get talked into one and then fight it for a year. A vintage table is the wrong choice if you need matching anything, pairs of chairs that line up perfectly, a surface that shrugs off every spill without a trace, or corners sharp enough for a toddler who's just learned to run. Old wood moves with the seasons, joints loosen a little, and a table that's lived eighty or a hundred years has its own opinions about level floors. If that sounds like a headache, buy new and buy well instead. But in an ordinary room, one of these does something a showroom set never will. It sits easy next to a plain canvas sofa, a rug with a worn patch nobody's bothered fixing, open shelving with mismatched mugs. It doesn't need the rest of the room to match its era. A good oak farmhouse table looks just as at home under a modern pendant as it did under whatever hung there in 1920.
How it ages depends entirely on what it's made of and how you treat it. Pine is soft and will dent, but those dents read as character within a year. Oak and walnut are harder, they darken beautifully with handling and light, and a little paste wax twice a year is really all they want. Avoid anything with a thick plastic feeling varnish, that's usually hiding damage rather than protecting good wood. Wipe spills quickly, use coasters for hot dishes, and don't panic over small scratches, they'll blend in faster than you'd think. What you don't want to do is sand it back to bare wood chasing a fresh look. You'll lose decades of color you can't buy back.
For sizing, measure your space and then take off a good twelve inches on each side beyond the table itself, so chairs can pull out without hitting a wall or a sideboard. Leave at least three feet of walking room on at least one side. A table that looks perfect in a showroom photo often turns out eight inches too long for a real dining room, so bring a tape measure before you fall for anything, and check the height too, old tables sometimes sit lower than you expect.