Is it ever too late to change to raw for a senior dog (lab 10½)

Not that anything is particularly wrong, I just think we could do better on raw food. Do you think it’s too late to change a 10½ year old to raw food?

Hi,
I have never used raw and never would.
I was advised by my vet the main reason dogs are taken to the vets is because the raw food has made the dog poorly and then needs to be on vet prescription food.
It can carry bacteria like E coli and salmonella that can not only make you dog poorly it can even make humans poorly too if the dog was to lick them.
What are the reasons for wanting to change to a raw diet?