There really should be a factual answer for this.
I have two year-old neutered male cats. I want them to live long and healthy lives.
The longest-lived cat I ever had lived to be 18. She died of cancer; I could have treated her but it was hella expensive, involved a 70-mile each way trip to a college with a veterinary school at a time when I didn’t have a car, it might not have worked, and–she was 18.
What she ate in her life was, Puss N Boots cat food, nasty smelling stuff that was full of some kind of bones, and raw calves’ liver cut into approximately half-inch chunks. She got liver several times a week and she loved it. She was also an outdoor cat who caught and ate cicadas, grasshoppers, and small rodents (mice, moles). She was quite healthy her whole life, until the end. Great fur (and lots of it, she was a Maine Coon cat), bright eyes, no signs of stiffness or pain in her daily activities. Being a cat she did sleep a lot, but she did a fair share of pouncing, too.
My more recent cats have lived to ages 14 (female) and 16 (male).
I have done a bunch of online searches to find out what’s best to feed neutered males. I’ve been told that once they reach a certain age they do better on wet food than dry food, but you can find anything to back up any weird opinion, on the internet. I want facts. What is the best thing to feed them so that they will never get sick and they’ll outlive me? Point me to some experts.
Currently feeding them Royal Canin for Neutered Male Cats (up to 7 years old).
ETA: It’s dry food, they are indoor cats, and they are domestic shorthair, basically, alley cats.