I have somewhat similar requirements as yours (80% AVR 20% 2-channel stereo) and close to your age (~66). I have the Marantz 8805 preamp, which I believe works very well for listening to movies and regular TV programs with surround sound and Atmos. I bought a pair of Magico A3s for the front left and right mains and a Salk Supercharged SongCenter for the center speaker (https://www.salksound.com/model.php?model=Supercharged%20SongCenter).
I found that the Magico A3s and the Salk Supercharged SongCenter are nicely matched. I have not found the A3s to be fatiguing at all even thought they have a Beryllium tweeter. In fact, excessive high-frequency brashness was one of the reasons why I de-selected several candidates (including Paradigms) when I was listening to and picking speakers.
I have found the Salk Supercharged SongCenter to be extremely clear as a center speaker and very musical. I recommend it highly. If you insist on matching the center with the front mains, you may want to consider some Salk left and right mains, as has already been suggested by other.
I found that the Magico A3s and the Salk Supercharged SongCenter are nicely matched. I have not found the A3s to be fatiguing at all even thought they have a Beryllium tweeter. In fact, excessive high-frequency brashness was one of the reasons why I de-selected several candidates (including Paradigms) when I was listening to and picking speakers.
I have found the Salk Supercharged SongCenter to be extremely clear as a center speaker and very musical. I recommend it highly. If you insist on matching the center with the front mains, you may want to consider some Salk left and right mains, as has already been suggested by other.