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Could it be that because he is older he may have something going on in his brain or something? That is all I can think of.
I think you might have answered your own question. And the others are right. It is not uncommon for older dogs (and cats) to be more unpredictable in their later years. I think they are more sensitive to petting (at least that is what we are experiencing with Murphy, our 14 year old Lab). Simple things like brushing and rubbing irritate her now, where before, when she was younger (according to my husband), she was never like that. Thankfully, we haven't experienced what you have with any biting incidents, but we are very cautious with her, and don't try to stir her up too much. Mimi, our 14 year old cat, is sweet and loving as she always has been, but we really have to watch her these days because she will turn on us in a heartbeat (especially me), and I don't want to upset her or have her hurt one of the children or a guest. Just one rub too many and she attacks with claws and teeth. She was never like this before the last year or so.