Absolutely agree with the above: Colder is better. A lot of the hype we see over DO here on the forum is simply overblown. If you can keep your beer cold you will extend the shelf life drastically and the colder the better up until the freezing point.
I agree that colder is better for added stability. As for dissolved oxygen in homebrewing, you may also say that it’s been largely overlooked, understated, and/or unattainable all of these years. I have certainly benefited in beer stability from using low oxygen brewing methods - my own personal sensory analysis has been proving this glass by glass by glass
I believe the recommended temp for cellaring (not refrigerating) beer is 50 - 55F. I converted a basement room into a wine/beer cellar and keep it at 51F in cold winter, 57F in hot summer, and 55F the rest of the time and it cellars beer just fine. I also make wine.
That said, AFAIK most beers suitable for cellaring are +6% ABV, give or take. I also recommend oxygen scavaging caps for cellared beers.