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Did the vet do bloodwork on the 11 yr old at the last checkup? If not, get it done. Low thyroid can cause aggression. Also, some meds like Rimadyl and prednisone can cause aggression.

Old dogs can also get dementia, and there are drugs to help with that.

Another problem that can occur between old/young dogs is the old one will start to lose hearing, and fail to miss a warning growl from the other dog, so the younger dog thinks the other one is being rude, then goes after the old one, who then feels unfairly attacked, and begins to look at the younger one with suspicion.
 
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