There is a lot of premium brands of cat food that may look expensive initially.
He's been on dry food since birth with expensive treats and occasionally a few pieces of meat - table scraps - of cooked chicken, beef, tuna, salmon or pork.
Avoid preservatives like ethoxyouin, and maybe BHA and BHT.
The different types provide appropriate nutrients and nutrition for cats at particular age. However, it is highly nutritious, so less in order to be certain.