I think you officially have most of us beat!Oldest Superman and Superboy comics:
Action Comics #54 (Nov 1942) and Adventure Comics #112 (Jan 1947), respectively.
Adventure Comics #112 is also my second oldest Superman comic, and Superboy #4 (Sep/Oct 1949) is third.
The oldest actual issue of Superman I have is Superman #98 (Jul 1955). That's also my second oldest Superman (sans Superboy) comic.
The vast majority of Silver Age Action Comics and Superman that I have date from the 1960s. I particularly collected imaginary stories and the Legion's run in Action. I have scattered issues of Jimmy Olsen, a couple issues of Lois Lane, and a decent number of World's Finest. I'm better on Bronze Age Superman (one of two series, the other being Superboy, that I bought regularly in the 1970s) and Action; I have nearly all of the Kirby run in Jimmy Olsen, and most of the Super Sons (the originals!) in World's Finest, along with other WFC.
But the real pride and joy is Superboy (and the Legion). I have Superboy (Legion) #4, 6-7, 9-10, 12-16, 20-21, 23-24, and 27-354, the last issue of Tales of the Legion. And I have the Legion's whole run as a feature in Adventure Comics, #300-380, plus about 8 earlier Superboy issues (including #112). (I don't actually have the Legion's first appearance in #247.)