I have 2 4yr old cats that get dry food majority of the time, as they're inside cats.
Then I just took in 2 outside kittens who had upper respiratory infections,bad pink eyes..so we've kept them seperated from the older cats..especially till I can get them tested for feline leukemia...and they get fed twice a day, and get Science Hills A/D can (wet) food.
Hope this helps.
Cindy