I suspect too many people think guns are like cars; that is, a 100 year old gun is nothing more than an antique, not worthy for consideration, definitely shouldn’t be shot.
Well.
I've got a few Smiths and Colts that have seen their centennial and are still going just as strong as the day they left the factory.
In fact, one of my favorite revolvers is a S&W .38 Hand Ejector, Military & Police (M&P—sound familiar?), 4th Change, 1921 vintage.
I’d sooner trust my life to it, loaded with modern 158gr+P SWCHP, than many new production revolvers.
And my 1918 Colt M1911? Runs HydraShok 100% reliably. Not quite as accurate as my Baer at 25 yards...but it'll make do.
And, if I gotta, I’ll drag out my 1896 vintage 1st Gen SAA in .45C; it'll still work just fine.
Rifles? Got a Swede M96, Oberndorff production, 1900...dropped a coyote with it at a quarter mile.
So, yeah. Old guns still work great.