I'm very sorry Tildie has passed away. It is sad news, or rather bittersweet news as she had a good run and passed away in the manner we'd all prefer.
My Renzo, who was born almost the same time as Minnie and Tildie, is still alive and reasonably well, but his kidneys are no longer working very well (he pees a lot, have to change his box at least once a day). I doubt he will live very much longer, but he has rallied with the spring sunshine and revels in it.
Renzo was a stray kitten who adopted me so I don't know his exact date of birth, but the vet looked at his teeth and could tell me how many weeks old he was.
I'd been wondering about the kitties, and especially Minnie and Tildie...
Funny, I always think of the Dunblane massacre happening longer ago...