Not the same breed as mine - so obviously breed has nothing to do with it!
I wonder if it could be like dandruff in humans?
I would normally say mention it to a vet if you are worried, but to be honest if it is not bothering her in any way then I would leave well alone (a dog that age going to the vet - well no doubt the vet would find any number of things wrong and it would end up costing a fortune). I believe in the old saying - if it aint broke don't fix it! The vet would probably do skin scrapes etc., but like I say at their age they really don't need the stress, especially if she is fine in herself.
My boy is nearly 13 and I know if I took him near a vet they would find any number of things to treat, as long as he is happy and eating well I am content just to let him enjoy his old age in peace.
Oh, and he has never had a bath in his life!