Feeding Advice? New Cat Owner:)

I recently adopted a cat as a rehome and i’ve fallen in LOVE with this boy. He’s 7 almost 8 and was eating friskies wet food twice a day for breakfast and dinner with dry for lunch. After doing some research over the years before adopting I was planning on switching after he got comfy with me. It’s been a month now and I now have him eating this. I was wondering what else I might should add or remove/replace to keep him living as LONG as possible since everyone around me is questioning why I got an “old” cat. (i know he’s more middle aged though)

in the morning he eats almost a whole can of fancy feasts classic chicken pate mixed with water topped with instinct skin and coat topper

for lunch he is still eating the dry (since money is tight and I didn’t buy this much for nothing)

and for dinner before bed he eats the same as the morning with but with freeze dried chicken and instinct digestive support toppers

I just want advice since i don’t have much hands on experience with cats. Any suggestions appreciated i just want my baby forever :,)