I have a Lee 303 made on an Irish action made in 1900.
A 1903 Breda Mannlicher 6.5X54 I made from an action which was made in the 20s.
Several of my Mausers are made on actions made in the 20 and 30s. In fact the newest one was made in 1968, an InnerArms Mark X.
I have 2 Mosin Nagants, made in 1927 and 1939s.
A 1942 M1 Garand
A Savage M-99 made in 1949
A Marlin 336 made in the mid 60s

My Dad and Uncle both bought Winchester 22s with their mustering-out pay at the end of WW2 and I have both of those rifles too, as well as my Uncle's M37 410 Winchester shotgun he got before WW2, in 1937.
My wife have a Winchester M75 Target 22, made in the 30s. She also owns a Mauser Broomhandle pistol made in 1917 which is unfired. (and for sale)
I have a Colt 1911 made in 1916.
I think that's all the "old ones" ---------------that I can think of right now. anyway.

I have owned a few guns made before 1900 but I no longer own any of them.
I Sold or traded them all.