Hi ! Varethane make a product called a weathered age accelerator . I got it at home depot or Lowe's . But it needs to be used on unfinished wood . So to use this you will need to sand down the furniture , which can be a big job . But the wood ager works great , it come in a brownish or grayish hue . I had some old pallet wood shelves that I needed to match for a wall pantry , it worked GREAT and was super easy ! Good luck !
Andrea: maybe these will help
Hello, Vinegar -wood finish for headboard might be the link you are looking for.
How to Get a Restoration Hardware Finish DIY | Hometalk
Thanks for all the response. The Hardware Restoration finish is exactly what I am looking to try on a buffet.