In the photos that you posted, Henry certainly looks like a senior kittizen. Please give him a big cuddle from me. Sunny sounds as though she reacts a little like our girls when Micky forces his evil way through the catflap. They give him a certain space, but really aren't too bothered.

I thought that Jack was much younger than your vet is saying. He certainly looked like a much younger boy. You would have to say that he was a lucky boy to be so healthy for so long.