I like older rifles in both centerfire and rimfire. Stopped subscribing to gun mags because I wasn't interested in the new stuff they have to promote to stay relevant. Some like new and others may have a mix of old and new. And of course there are newer versions of old models or designs that can satisfy as well. Took a look at my list of a dozen plus a few to age them. A few didn't have serial numbers but had other stampings or clues to get manufacture year or close to it. One I didn't want to take apart to look for barrel markings so used the last year it was produced which was still 58 years ago.
Came up with an average of 77.0 and a range of 29 to 129 years with youngest being a 356 Win Big Bore and oldest an 1884 Trapdoor made in the last year of production.