I think the normal aging of a rifle, or any type of firearm to the extent that the wood darkens, the barrel takes on a patina, and honest bruises and dings all create the appearance of many years of use will take years if not decades to naturally occur depending on the the owners time spent and conditions encountered when using the rifle. While there are some techniques and chemicals that can do an OK job to creat an aged look to a “new” rifle, the best examples of artificial aging I have seen were “planned” into the building of the rifle with an clear understanding as to the degree of aging desired, careful study of genuine examples, and the skills to execute well.