AWWW, your bunnies are gorgeous. I can put them in the gallery if you'd like. I can take the larger picture directly from your post, but the avatar picture is too small for me to put the gallery, so you'd have to send it to me.
Regarding the other issue, after reading and researching, if you feel like it might not be old age, but something else, you might seek out another vet or ask that vet how she knows it's due to old age.
What does your gut feeling say about this so far?